/* Copyright (C) 2014 InfiniDB, Inc.
   Copyright (C) 2016 MariaDB Corporation

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; version 2 of
   the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */

/* $Id: ddl.y 9314 2013-03-19 17:39:25Z dhall $ */
/* This describes a substantial subset of SQL92 DDL with some
   enhancements from various vendors.  Most of the nomenclature in the
   grammar is drawn from SQL92. 

   If you have to care about this grammar, you should consult one or
   more of the following sources:

   Lex and Yacc book.
   ANSI SQL92 standard
   Understanding the New Sql book
   The postgress and mysql sources.  find x -name \*.y -o -name \*.yy.

   We support quoted identifiers.

   All literals are stored as unconverted strings.

   You can't say "NOT DEFERRABLE".  See the comment below.

   This is a reentrant parser.

   MCOL-66 Modify to be a reentrant parser
   */

%{
#include "sqlparser.h"

#ifdef _MSC_VER
#include "ddl-gram-win.h"
#else
#include "ddl-gram.h"
#endif

#include "my_global.h"
#include "my_sys.h"

#define scanner x->scanner

using namespace std;
using namespace ddlpackage;	

int ddllex(YYSTYPE* ddllval, void* yyscanner);
void ddlerror(struct pass_to_bison* x, char const *s);
char* copy_string(const char *str);

void fix_column_length(SchemaObject* elem, const CHARSET_INFO* def_cs) {
    auto* column = dynamic_cast<ColumnDef*>(elem);
    if (column == NULL || column->fType == NULL)
    {
        return;
    }

    if (column->fType->fType == DDL_VARCHAR ||
         column->fType->fType == DDL_CHAR ||
         (column->fType->fType == DDL_TEXT && column->fType->fExplicitLength))
    {
        unsigned mul = def_cs ? def_cs->mbmaxlen : 1;
        if (column->fType->fCharset) {
            const CHARSET_INFO* cs = get_charset_by_csname(column->fType->fCharset, MY_CS_PRIMARY, MYF(0));
            if (cs)
                mul = cs->mbmaxlen;
        }
        column->fType->fLength *= mul;
    }

    if (column->fType->fType == DDL_TEXT && column->fType->fExplicitLength)
    {
        // Rounding the resulting length of TEXT(N) field to the next default length
        if (column->fType->fLength <= 255)
            column->fType->fLength = 255;
        else if (column->fType->fLength <= 65535)
            column->fType->fLength = 65535;
        else if (column->fType->fLength <= 16777215)
            column->fType->fLength = 16777215;
        else if (column->fType->fLength <= 2100000000)
            column->fType->fLength = 2100000000;
        // otherwise leave the decision to a caller code
    }
}

%}

%expect 17
%pure-parser
%lex-param {void * scanner}
%parse-param {struct ddlpackage::pass_to_bison * x}

 /* Bison uses this to generate a C union definition.  This is used to
	store the application created values associated with syntactic
	constructs. */

%union {
  ddlpackage::AlterTableStatement *alterTableStmt;
  ddlpackage::AlterTableAction *ata;
  ddlpackage::AlterTableActionList *ataList;
  ddlpackage::DDL_CONSTRAINT_ATTRIBUTES cattr;
  std::pair<std::string, std::string> *tableOption;
  const char *columnOption;
  ddlpackage::ColumnConstraintDef *columnConstraintDef;
  ddlpackage::ColumnNameList *columnNameList;
  ddlpackage::ColumnType* columnType;
  ddlpackage::ConstraintAttributes *constraintAttributes;
  ddlpackage::ColumnConstraintList *constraintList;
  ddlpackage::DDL_CONSTRAINTS constraintType;
  double dval;
  bool flag;
  int ival;
  ddlpackage::QualifiedName *qualifiedName;
  ddlpackage::SchemaObject *schemaObject;
  ddlpackage::SqlStatement *sqlStmt;
  ddlpackage::SqlStatementList *sqlStmtList;
  const char *str;
  ddlpackage::TableConstraintDef *tableConstraint;
  ddlpackage::TableElementList *tableElementList;
  ddlpackage::TableOptionMap *tableOptionMap;
  ddlpackage::ColumnDefaultValue *colDefault;
  ddlpackage::DDL_MATCH_TYPE matchType;
  ddlpackage::DDL_REFERENTIAL_ACTION refActionCode;
  ddlpackage::ReferentialAction *refAction;
};

%{

%}

%token ACTION ADD ALTER AUTO_INCREMENT BIGINT BIT BLOB IDB_BLOB CASCADE IDB_CHAR
CHARACTER CHECK CLOB COLUMN
BOOL BOOLEAN
COLUMNS COMMENT CONSTRAINT CONSTRAINTS CREATE CURRENT_USER DATETIME DEC
DECIMAL DEFAULT DEFERRABLE DEFERRED IDB_DELETE DROP ENGINE
FOREIGN FULL IMMEDIATE INDEX INITIALLY IDB_INT INTEGER KEY LONGBLOB LONGTEXT
MATCH MAX_ROWS MEDIUMBLOB MEDIUMTEXT MEDIUMINT
MIN_ROWS MODIFY NO NOT NULL_TOK NUMBER NUMERIC ON PARTIAL PRECISION PRIMARY
REFERENCES RENAME RESTRICT SET SMALLINT TABLE TEXT TINYBLOB TINYTEXT
TINYINT TO UNIQUE UNSIGNED UPDATE USER SESSION_USER SIGNED SYSTEM_USER VARCHAR VARBINARY
VARYING WITH ZONE DOUBLE IDB_FLOAT REAL CHARSET COLLATE IDB_IF EXISTS CHANGE TRUNCATE
TIMESTAMP
ZEROFILL

%token <str> DQ_IDENT IDENT FCONST SCONST CP_SEARCH_CONDITION_TEXT ICONST DATE TIME

/* Notes:
 * 1. "ata" stands for alter_table_action
 * 2. The %type statements are how bison figures out what element of
 * above union to use in generated code.  It's a little weird because
 * you say "type" but what you specify is an member the union.
 */
%type <ata>                  add_table_constraint_def
%type <ata>                  alter_column_def
%type <ata>                  alter_table_action
%type <ataList>              alter_table_actions
%type <sqlStmt>              alter_table_statement
%type <ata>                  ata_add_column
%type <ata>                  ata_rename_table
%type <columnType>           character_string_type
%type <columnType>           binary_string_type
%type <columnType>           blob_type
%type <columnType>           text_type
%type <str>                  check_constraint_def
%type <columnConstraintDef>  column_constraint
%type <columnConstraintDef>  column_constraint_def
%type <schemaObject>         column_def
%type <str>                  column_name
%type <columnNameList>       column_name_list
%type <constraintAttributes> constraint_attributes
%type <cattr>                constraint_check_time
%type <str>                  constraint_name
%type <sqlStmt>              create_table_statement
%type <sqlStmt>              create_index_statement
%type <columnType>           data_type
%type <columnType>           datetime_type
%type <colDefault>           default_clause
%type <cattr>                deferrability_clause
%type <refActionCode>        delete_rule
%type <refActionCode>        drop_behavior
%type <ata>                  drop_column_def
%type <ata>                  drop_table_constraint_def
%type <sqlStmt>              drop_index_statement
%type <sqlStmt>              drop_table_statement
%type <refActionCode>        opt_delete_rule
%type <columnType>           exact_numeric_type
%type <str>                  literal
%type <matchType>            opt_match_type
%type <matchType>            match_type
%type <ata>                  alter_table_comment
%type <ata>                  modify_column
%type <columnType>           numeric_type
%type <constraintList>       column_qualifier_list
%type <constraintAttributes> opt_constraint_attributes
%type <str>                  opt_constraint_name
%type <cattr>                opt_deferrability_clause
%type <columnType>           opt_precision_scale
%type <refAction>            opt_referential_triggered_action
%type <ival>                 opt_time_precision
%type <qualifiedName>        qualified_name
%type <refActionCode>        referential_action
%type <refAction>            referential_triggered_action
%type <schemaObject>         referential_constraint_def
%type <ata>                  rename_column
%type <sqlStmt>              stmt
%type <sqlStmtList>          stmtblock
%type <sqlStmtList>          stmtmulti
%type <str>                  string_literal
%type <schemaObject>         table_constraint
%type <schemaObject>         table_constraint_def
%type <schemaObject>         table_element
%type <tableElementList>     table_element_list
%type <qualifiedName>        table_name
%type <tableOption>          table_option
%type <columnOption>         column_option
%type <tableOptionMap>       table_options
%type <tableOptionMap>       opt_table_options
%type <schemaObject>         unique_constraint_def
%type <constraintType>       unique_specifier
%type <refActionCode>        update_rule
%type <refActionCode>        opt_update_rule
%type <columnType>           approximate_numeric_type
%type <str>                  opt_display_width
%type <str> 		     	 opt_display_precision_scale_null
%type <str>                  opt_if_exists
%type <str>                  opt_if_not_exists
%type <str>                  opt_signed
%type <str>                  opt_zerofill
%type <sqlStmt>              trunc_table_statement
%type <sqlStmt>              rename_table_statement
%type <str>                  ident
%type <str>                  opt_quoted_literal
%type <str>                  opt_column_charset
%%
stmtblock:	stmtmulti { x->fParseTree = $1; }
		;


stmtmulti:
	stmtmulti ';' stmt
	{
		if ($3 != NULL) {
			$1->push_back($3);
			$$ = $1;
		}
		else {
			$$ = $1;
		}
	}
	| stmt
	{ 
		if ($1 != NULL)
		{
			$$ = x->fParseTree;
			$$->push_back($1);
		}
		else
		{
			$$ = NULL;
		}
	}


stmt:
	alter_table_statement
	| create_table_statement
	| drop_index_statement
	| drop_table_statement
	| create_index_statement
	| trunc_table_statement
	| rename_table_statement
	| { $$ = NULL; }
	;

drop_table_statement:
	DROP TABLE opt_if_exists qualified_name {$$ = new DropTableStatement($4, false);}
	| DROP TABLE opt_if_exists qualified_name CASCADE CONSTRAINTS
	{
		{$$ = new DropTableStatement($4, true);}
	}
	;

opt_if_exists:
	IDB_IF EXISTS {$$ = NULL;}
	| {$$ = NULL;}
	;

drop_index_statement:
	DROP INDEX qualified_name {$$ = new DropIndexStatement($3);}
	;
	
/* Notice that we allow table_options here (e.g. engine=infinidb) but
   we ignore them. */
create_index_statement:
	CREATE INDEX qualified_name ON qualified_name '(' column_name_list ')' opt_table_options
	{
		$$ = new CreateIndexStatement($3, $5, $7, false);
		delete $9;
	}
	| CREATE UNIQUE INDEX qualified_name ON qualified_name '(' column_name_list ')' opt_table_options
	{
		$$ = new CreateIndexStatement($4, $6, $8, true);
		delete $10;
	}
	;

opt_table_options:
	table_options
	| {$$ = NULL;}
	;

create_table_statement:
	CREATE TABLE opt_if_not_exists table_name '(' table_element_list ')' opt_table_options
	{
        for (auto* elem : *$6)
        {
            fix_column_length(elem, x->default_table_charset);
        }
		$$ = new CreateTableStatement(new TableDef($4, $6, $8));
	}
	;

opt_if_not_exists:
	IDB_IF NOT EXISTS {$$ = NULL;}
	| {$$ = NULL;}
	;

trunc_table_statement:
	TRUNCATE TABLE qualified_name {$$ = new TruncTableStatement($3);}
	| TRUNCATE qualified_name { {$$ = new TruncTableStatement($2);} }
	;

rename_table_statement:
    RENAME TABLE qualified_name TO qualified_name
    {
        // MCOL-876. The change reuses existing infrastructure. 
        AtaRenameTable* renameAction = new AtaRenameTable($5);
        AlterTableActionList* actionList = new AlterTableActionList();
        actionList->push_back(renameAction);
        $$ = new AlterTableStatement($3, actionList);
    }

table_element_list:
	table_element
	{
		$$ = new TableElementList();
		$$->push_back($1);
	}
	|
	table_element_list ',' table_element
	{
		$$ = $1;
		$$->push_back($3);
	}
	;

table_element:
	column_def
	| table_constraint_def
	;

table_constraint_def:
	CONSTRAINT opt_constraint_name table_constraint opt_constraint_attributes
	{
		$$ = $3;
		$3->fName = $2;
	}
	|
	opt_constraint_name table_constraint opt_constraint_attributes
	{
		$$ = $2;
		$2->fName = $1;
	}
	;

opt_constraint_name:
	constraint_name {$$ = $1;}
	| {$$ = "noname";}
	;

table_constraint:
	unique_constraint_def
	| referential_constraint_def
	| check_constraint_def {$$ = new TableCheckConstraintDef($1);}
	;

unique_constraint_def:
	unique_specifier '(' column_name_list ')'
	{
		if ($1 == DDL_UNIQUE)
		    $$ = new TableUniqueConstraintDef($3);
        else if ($1 == DDL_PRIMARY_KEY)
            $$ = new TablePrimaryKeyConstraintDef($3);
	}
	;

column_name_list:
	column_name
	{
		$$ = new vector<string>;
		$$->push_back($1);
	}
	| column_name_list ',' column_name
	{
		$$ = $1;
		$$->push_back($3);
	}
	;

unique_specifier:
	PRIMARY KEY {$$ = DDL_PRIMARY_KEY;}
	| UNIQUE {$$ = DDL_UNIQUE;}
	;

referential_constraint_def:
	FOREIGN KEY '(' column_name_list ')' REFERENCES	table_name '(' column_name_list ')' opt_match_type opt_referential_triggered_action
	{
		$$ = new TableReferencesConstraintDef($4, $7, $9, $11, $12);
	}
	;

opt_match_type:
	match_type
	| {$$ = DDL_FULL;}
	;

match_type:
	MATCH match_type {$$ = $2;}
	;

match_type:
	FULL {$$ = DDL_FULL;}
	| PARTIAL {$$ = DDL_PARTIAL;}
	;

opt_referential_triggered_action:
	referential_triggered_action
	| {$$ = NULL;}
	;

referential_triggered_action:
	update_rule opt_delete_rule
	{
		$$ = new ReferentialAction();
		$$->fOnUpdate = $1;
		$$->fOnDelete = $2;
	}
	| delete_rule opt_update_rule
	{
		$$ = new ReferentialAction();
		$$->fOnUpdate = $2;
		$$->fOnDelete = $1;
	}
	;

opt_delete_rule:
	delete_rule
	| {$$ = DDL_NO_ACTION;}
	;

opt_update_rule:
	update_rule
	| {$$ = DDL_NO_ACTION;}
	;

update_rule:
	ON UPDATE referential_action {$$ = $3;}
	;

delete_rule:
	ON IDB_DELETE referential_action {$$ = $3;}
	;

referential_action:
	CASCADE {$$ = DDL_CASCADE;}
	| SET NULL_TOK {$$ = DDL_SET_NULL;}
	| SET DEFAULT {$$ = DDL_SET_DEFAULT;}
	| NO ACTION {$$ = DDL_NO_ACTION;}
	| RESTRICT {$$ = DDL_RESTRICT;}
	;

table_options:
	table_option
	{
		$$ = new TableOptionMap();
		(*$$)[$1->first] = $1->second;
		delete $1;
	}	
	| table_options table_option
	{
		$$ = $1;
		(*$$)[$2->first] = $2->second;
		delete $2;
	}
	;

opt_equal:
	{} | '=' {}
	;

table_option:
 	ENGINE opt_equal ident {$$ = new pair<string,string>("engine", $3);}
	|
 	MAX_ROWS opt_equal ICONST {$$ = new pair<string,string>("max_rows", $3);}
 	|
 	MIN_ROWS opt_equal ICONST {$$ = new pair<string,string>("min_rows", $3);}
 	|
 	COMMENT opt_equal string_literal {$$ = new pair<string,string>("comment", $3);}
	|
	COMMENT string_literal {$$ = new pair<string,string>("comment", $2);}
 	|
	AUTO_INCREMENT opt_equal ICONST
    {
       $$ = new pair<string,string>("auto_increment", $3);
    }
 	|
 	DEFAULT CHARSET opt_equal ident {$$ = new pair<string,string>("default charset", $4);}
    |
    CHARSET opt_equal ident {$$ = new pair<string, string>("default charset", $3);}
 	|
 	DEFAULT IDB_CHAR SET opt_equal ident {$$ = new pair<string,string>("default charset", $5);}
    |
    DEFAULT COLLATE opt_equal opt_quoted_literal {$$ = new pair<string, string>("default collate", $4);}
    |
    COLLATE opt_equal opt_quoted_literal {$$ = new pair<string, string>("default collate", $3);}
	;

alter_table_statement:
	ALTER TABLE table_name alter_table_actions
	{
		$$ = new AlterTableStatement($3, $4);
	}
	;

alter_table_actions:
	alter_table_action
	{
		if ($1 != NULL) {
			$$ = new AlterTableActionList();
			$$->push_back($1);
		}
		else {
			/* An alter_table_statement requires at least one action.
			   So, this shouldn't happen. */
			$$ = NULL;
		}		
	}
	| alter_table_actions ',' alter_table_action
	{
		$$ = $1;
		$$->push_back($3);
	}
	| alter_table_actions alter_table_action
	{
		$$ = $1;
		$$->push_back($2);
	}
	;

alter_table_action:
	ata_add_column
	| drop_column_def
	| alter_column_def
	| add_table_constraint_def
	| drop_table_constraint_def
	| ata_rename_table
	| modify_column
	| rename_column
    | alter_table_comment
	;

alter_table_comment:
    COMMENT opt_equal string_literal
    {$$ = new AtaTableComment($3);}
    |
    COMMENT string_literal
    {$$ = new AtaTableComment($2);}
    ;



modify_column:
	MODIFY column_name data_type
	{$$ = new AtaModifyColumnType($2,$3);}
	|
	MODIFY COLUMN column_name data_type
	{$$ = new AtaModifyColumnType($3,$4);}
	;


rename_column:
	CHANGE column_name column_name data_type
	{$$ = new AtaRenameColumn($2, $3, $4, NULL);}
	|CHANGE column_name column_name data_type column_option
	{$$ = new AtaRenameColumn($2, $3, $4, $5);}
	|CHANGE COLUMN column_name column_name data_type
	{$$ = new AtaRenameColumn($3, $4, $5, NULL);}
	|CHANGE COLUMN column_name column_name data_type column_option
	{$$ = new AtaRenameColumn($3, $4, $5, $6);}
	|CHANGE column_name column_name data_type column_qualifier_list
	{$$ = new AtaRenameColumn($2, $3, $4, $5, NULL);}
	|CHANGE COLUMN column_name column_name data_type column_qualifier_list
	{$$ = new AtaRenameColumn($3, $4, $5, $6, NULL);}
	|CHANGE column_name column_name data_type column_qualifier_list column_option
	{$$ = new AtaRenameColumn($2, $3, $4, $5, NULL, $6);}
	|CHANGE COLUMN column_name column_name data_type column_qualifier_list column_option
	{$$ = new AtaRenameColumn($3, $4, $5, $6, NULL, $7);}
	|CHANGE column_name column_name data_type default_clause 
	{$$ = new AtaRenameColumn($2, $3, $4, NULL, $5);}
	|CHANGE COLUMN column_name column_name data_type default_clause
	{$$ = new AtaRenameColumn($3, $4, $5, NULL, $6);}
	|CHANGE column_name column_name data_type default_clause column_option
	{$$ = new AtaRenameColumn($2, $3, $4, NULL, $5, $6);}
	|CHANGE COLUMN column_name column_name data_type default_clause column_option
	{$$ = new AtaRenameColumn($3, $4, $5, NULL, $6, $7);}
	|CHANGE column_name column_name data_type column_qualifier_list default_clause 
	{$$ = new AtaRenameColumn($2, $3, $4, $5, $6);}
	|CHANGE COLUMN column_name column_name data_type column_qualifier_list default_clause
	{$$ = new AtaRenameColumn($3, $4, $5, $6, $7);}
	|CHANGE column_name column_name data_type default_clause column_qualifier_list  
	{$$ = new AtaRenameColumn($2, $3, $4, $6, $5);}
	|CHANGE COLUMN column_name column_name data_type default_clause column_qualifier_list
	{$$ = new AtaRenameColumn($3, $4, $5, $7, $6);}
	|CHANGE column_name column_name data_type column_qualifier_list default_clause column_option
	{$$ = new AtaRenameColumn($2, $3, $4, $5, $6, $7);}
	|CHANGE COLUMN column_name column_name data_type column_qualifier_list default_clause column_option
	{$$ = new AtaRenameColumn($3, $4, $5, $6, $7, $8);}	
	|CHANGE column_name column_name data_type default_clause column_qualifier_list column_option
	{$$ = new AtaRenameColumn($2, $3, $4, $6, $5, $7);}
	|CHANGE COLUMN column_name column_name data_type default_clause column_qualifier_list column_option
	{$$ = new AtaRenameColumn($3, $4, $5, $7, $6, $8);}	
	;

drop_table_constraint_def:
	DROP CONSTRAINT constraint_name drop_behavior
	{
		$$ = new AtaDropTableConstraint($3, $4);
	}
	;

add_table_constraint_def:
	ADD table_constraint_def {$$ = new AtaAddTableConstraint(dynamic_cast<TableConstraintDef *>($2));}
	;

ata_rename_table:
	RENAME table_name {$$ = new AtaRenameTable($2);}
	| RENAME TO table_name {$$ = new AtaRenameTable($3);}
	;

table_name:
	qualified_name
	;

qualified_name:
	ident {
				if (x->fDBSchema.size())
					$$ = new QualifiedName((char*)x->fDBSchema.c_str(), $1);
				else
				    $$ = new QualifiedName($1);   
			}
    | ident '.' ident
        {
            $$ = new QualifiedName($1, $3);
        }
	;

ident:
    DQ_IDENT
    | IDENT
    ;

ata_add_column:
    /* See the documentation for SchemaObject for an explanation of why we are using
     * dynamic_cast here.
     */
	ADD column_def { fix_column_length($2, x->default_table_charset); $$ = new AtaAddColumn(dynamic_cast<ColumnDef*>($2));}
	| ADD COLUMN column_def { fix_column_length($3, x->default_table_charset); $$ = new AtaAddColumn(dynamic_cast<ColumnDef*>($3));}
	| ADD '(' table_element_list ')' {
        for (auto* elem : *$3) {
            fix_column_length(elem, x->default_table_charset);
        }
        $$ = new AtaAddColumns($3);
    }
	| ADD COLUMN '(' table_element_list ')' {
        for (auto* elem : *$4) {
            fix_column_length(elem, x->default_table_charset);
        }
        $$ = new AtaAddColumns($4);
    }
	;

column_name:
    TIME
	|DATE
	|ident
	;

constraint_name:
	ident
	;

column_option:
	COMMENT  string_literal {$$ = $2;}
	
column_def:	
	column_name data_type opt_null_tok
	{
		$$ = new ColumnDef($1, $2, NULL, NULL );
	}
	| column_name data_type opt_null_tok column_qualifier_list
	{
		$$ = new ColumnDef($1, $2, $4, NULL);
	}
	| column_name data_type opt_null_tok default_clause column_qualifier_list
	{
		$$ = new ColumnDef($1, $2, $5, $4);
	}
	| column_name data_type opt_null_tok default_clause
	{
		$$ = new ColumnDef($1, $2, NULL, $4, NULL);
	}
	| column_name data_type opt_null_tok column_option
	{
		$$ = new ColumnDef($1, $2, NULL, NULL, $4 );
	}
	| column_name data_type opt_null_tok column_qualifier_list column_option
	{
		$$ = new ColumnDef($1, $2, $4, NULL, $5);
	}
	| column_name data_type opt_null_tok default_clause column_qualifier_list column_option
	{
		$$ = new ColumnDef($1, $2, $5, $4, $6);
	}
	| column_name data_type opt_null_tok column_qualifier_list default_clause
	{
		$$ = new ColumnDef($1, $2, $4, $5);
	}
	| column_name data_type opt_null_tok column_qualifier_list default_clause column_option
	{
		$$ = new ColumnDef($1, $2, $4, $5, $6);
	}
	| column_name data_type opt_null_tok default_clause column_option
	{
		$$ = new ColumnDef($1, $2, NULL, $4, $5);
	}
	;

opt_null_tok:
	/* empty */
	|
	NULL_TOK
	;

default_clause:
	DEFAULT literal
	{
		$$ = new ColumnDefaultValue($2);
	}
	| DEFAULT DQ_IDENT /* MCOL-1406 */
	{
		$$ = new ColumnDefaultValue($2);
	}
	| DEFAULT NULL_TOK {$$ = new ColumnDefaultValue(NULL);}
	| DEFAULT USER {$$ = new ColumnDefaultValue("$USER");}
	| DEFAULT CURRENT_USER optional_braces {$$ = new ColumnDefaultValue("$CURRENT_USER");}
	| DEFAULT SESSION_USER {$$ = new ColumnDefaultValue("$SESSION_USER");}
	| DEFAULT SYSTEM_USER {$$ = new ColumnDefaultValue("$SYSTEM_USER");}
	;

optional_braces:
	/* empty */ {}
	| '(' ')' {}
	;

opt_column_charset:
    /* empty */ { $$ = NULL; }
    |
    IDB_CHAR SET opt_quoted_literal { $$ = $3; }
    ;

opt_column_collate:
    /* empty */ {}
    |
    COLLATE opt_quoted_literal {}
    ;

data_type:
	character_string_type opt_column_charset opt_column_collate {
        $1->fCharset = $2;
        $$ = $1;
    }
	| binary_string_type
	| numeric_type
	| datetime_type
	| blob_type
	| text_type opt_column_charset opt_column_collate {
        $1->fCharset = $2;
        $$ = $1;
    }
	| IDB_BLOB
	{
		$$ = new ColumnType(DDL_BLOB);
		$$->fLength = DDLDatatypeLength[DDL_BLOB];
	}
	| CLOB
	{
		$$ = new ColumnType(DDL_CLOB);
		$$->fLength = DDLDatatypeLength[DDL_CLOB];
	}

	;

column_qualifier_list:
	column_constraint_def
	{
		$$ = new ColumnConstraintList();
		$$->push_back($1);
	}	
	| column_qualifier_list column_constraint_def
	{
		$$ = $1;
		$$->push_back($2);
	}
	;

column_constraint_def:
	column_constraint opt_constraint_attributes
	{
		$$ = $1;

		if($2 != NULL)
		{
			$1->fDeferrable = $2->fDeferrable;
			$1->fCheckTime = $2->fCheckTime;
		}

	}
	| CONSTRAINT constraint_name column_constraint opt_constraint_attributes
	{
		$$ = $3;
		$3->fName = $2;

		if($4 != NULL)
		{
			$3->fDeferrable = $4->fDeferrable;
			$3->fCheckTime = $4->fCheckTime;
		}
		
	}
	;

opt_constraint_attributes:
	constraint_attributes {$$ = $1;}
	| {$$ = NULL;}
	;

constraint_attributes:
	constraint_check_time opt_deferrability_clause
	{
		$$ = new ConstraintAttributes($1, ($2 != 0));
	}
	|
	DEFERRABLE constraint_check_time
	{
		$$ = new ConstraintAttributes($2, true);
	}
/*
	|
	NOT DEFERRABLE constraint_check_time
	{
		$$ = new ConstraintAttributes($3, false);
	}
*/
	;

opt_deferrability_clause:
	deferrability_clause
	| {$$ = DDL_NON_DEFERRABLE;}
	;

deferrability_clause:
	DEFERRABLE {$$ = DDL_DEFERRABLE;}

/* The rule below forces a shift/shift conflict.  This will require
scanner hacking or something. Since constraints are non-deferrable by
default, I'm putting this off. You can still express all the cases,
you just can't say NOT DEFERRABLE. */

/*	| NOT DEFERRABLE {$$ = DDL_DEFERRABLE;} */
	;

constraint_check_time:
	INITIALLY DEFERRED {$$ = DDL_INITIALLY_DEFERRED;}
	| INITIALLY IMMEDIATE {$$ = DDL_INITIALLY_IMMEDIATE;}
	;

column_constraint:
	NOT NULL_TOK {$$ = new ColumnConstraintDef(DDL_NOT_NULL);}
	| UNIQUE {$$ = new ColumnConstraintDef(DDL_UNIQUE);}
	| PRIMARY KEY {$$ = new ColumnConstraintDef(DDL_PRIMARY_KEY);}
	| AUTO_INCREMENT {$$ = new ColumnConstraintDef(DDL_AUTO_INCREMENT);}
	| check_constraint_def {$$ = new ColumnConstraintDef($1);}
	;

check_constraint_def:
	CHECK '(' CP_SEARCH_CONDITION_TEXT ')' {$$ = $3;}
	;

string_literal:
	'\'' SCONST '\'' {$$ = $2;}
	; 

opt_quoted_literal:
    string_literal
    |
    ident
    ;

character_string_type:
	CHARACTER
	{
		$$ = new ColumnType(DDL_CHAR);
		$$->fLength = 1;
	}
	| IDB_CHAR
	{
		$$ = new ColumnType(DDL_CHAR);
		$$->fLength = 1;
	}
	| CHARACTER '(' ICONST ')'
	{
		$$ = new ColumnType(DDL_CHAR);
		$$->fLength = atoi($3);
	}
	| IDB_CHAR '(' ICONST ')'
	{
		$$ = new ColumnType(DDL_CHAR);
		$$->fLength = atoi($3);
	}
	| CHARACTER VARYING '(' ICONST ')'
	{
		$$ = new ColumnType(DDL_VARCHAR);
		$$->fLength = atoi($4);
	}

	| IDB_CHAR VARYING '(' ICONST ')'
	{
		$$ = new ColumnType(DDL_VARCHAR);
		$$->fLength = atoi($4);
	}

	| VARCHAR '(' ICONST ')'
	{
		$$ = new ColumnType(DDL_VARCHAR);
		$$->fLength = atoi($3);
	}
	;

binary_string_type:
	VARBINARY '(' ICONST ')'
	{
		$$ = new ColumnType(DDL_VARBINARY);
		$$->fLength = atoi($3);
	}
	;

blob_type:
	BLOB '(' ICONST ')'
	{
		$$ = new ColumnType(DDL_BLOB);
		$$->fLength = atol($3);
	}
	| BLOB
	{
		$$ = new ColumnType(DDL_BLOB);
		$$->fLength = 65535;
	}
	| TINYBLOB
	{
		$$ = new ColumnType(DDL_BLOB);
		$$->fLength = 255;
	}
	| MEDIUMBLOB
	{
		$$ = new ColumnType(DDL_BLOB);
		$$->fLength = 16777215;
	}
	| LONGBLOB
	{
		$$ = new ColumnType(DDL_BLOB);
		$$->fLength = 2100000000;
	}
	;

text_type:
	TEXT '(' ICONST ')'
	{
		$$ = new ColumnType(DDL_TEXT);
		$$->fLength = atol($3);
		$$->fExplicitLength = true;
	}
	| TEXT
	{
		$$ = new ColumnType(DDL_TEXT);
		$$->fLength = 65535;
	}
	| TINYTEXT
	{
		$$ = new ColumnType(DDL_TEXT);
		$$->fLength = 255;
	}
	| MEDIUMTEXT
	{
		$$ = new ColumnType(DDL_TEXT);
		$$->fLength = 16777215;
	}
	| LONGTEXT
	{
		$$ = new ColumnType(DDL_TEXT);
		$$->fLength = 2100000000;
	}
	;

numeric_type:
	exact_numeric_type
	| approximate_numeric_type
	;

exact_numeric_type:
	NUMERIC opt_precision_scale
	{
		$2->fType = DDL_NUMERIC;
		$2->fLength = DDLDatatypeLength[DDL_NUMERIC];
		$$ = $2;
	}
	| NUMERIC opt_precision_scale UNSIGNED
	{
		$2->fType = DDL_UNSIGNED_NUMERIC;
		$2->fLength = DDLDatatypeLength[DDL_UNSIGNED_NUMERIC];
		$$ = $2;
	}
	| DECIMAL opt_precision_scale opt_signed
	{
		$2->fType = DDL_DECIMAL;
		$$ = $2;
	}
	| DECIMAL opt_precision_scale UNSIGNED opt_zerofill
	{
		$2->fType = DDL_UNSIGNED_DECIMAL;
		$$ = $2;
	}
	| NUMBER opt_precision_scale
	{
		$2->fType = DDL_DECIMAL;
		$2->fLength = DDLDatatypeLength[DDL_DECIMAL];
		$$ = $2;
	}
	| NUMBER opt_precision_scale UNSIGNED
	{
		$2->fType = DDL_UNSIGNED_DECIMAL;
		$2->fLength = DDLDatatypeLength[DDL_UNSIGNED_DECIMAL];
		$$ = $2;
	}
	| INTEGER opt_display_width
	{
		$$ = new ColumnType(DDL_INT);
		$$->fLength = DDLDatatypeLength[DDL_INT];
	}
	| IDB_INT opt_display_width
	{
		$$ = new ColumnType(DDL_INT);
		$$->fLength = DDLDatatypeLength[DDL_INT];
	}
	| SMALLINT opt_display_width
	{
		$$ = new ColumnType(DDL_SMALLINT);
		$$->fLength = DDLDatatypeLength[DDL_SMALLINT];
	}
	| TINYINT opt_display_width
	{
		$$ = new ColumnType(DDL_TINYINT);
		$$->fLength = DDLDatatypeLength[DDL_TINYINT];
	}
	| BIGINT opt_display_width
	{
		$$ = new ColumnType(DDL_BIGINT);
		$$->fLength = DDLDatatypeLength[DDL_BIGINT];
	}
	| INTEGER opt_display_width UNSIGNED
	{
		$$ = new ColumnType(DDL_UNSIGNED_INT);
		$$->fLength = DDLDatatypeLength[DDL_INT];
	}
	| IDB_INT opt_display_width UNSIGNED
	{
		$$ = new ColumnType(DDL_UNSIGNED_INT);
		$$->fLength = DDLDatatypeLength[DDL_INT];
	}
	| SMALLINT opt_display_width UNSIGNED
	{
		$$ = new ColumnType(DDL_UNSIGNED_SMALLINT);
		$$->fLength = DDLDatatypeLength[DDL_SMALLINT];
	}
	| TINYINT opt_display_width UNSIGNED
	{
		$$ = new ColumnType(DDL_UNSIGNED_TINYINT);
		$$->fLength = DDLDatatypeLength[DDL_TINYINT];
	}
	| BIGINT opt_display_width UNSIGNED
	{
		$$ = new ColumnType(DDL_UNSIGNED_BIGINT);
		$$->fLength = DDLDatatypeLength[DDL_BIGINT];
	}
        | BOOLEAN
        {
                $$ = new ColumnType(DDL_TINYINT);
                $$->fLength = DDLDatatypeLength[DDL_TINYINT];
                $$->fPrecision = 1;
        }
        | BOOL
        {
                $$ = new ColumnType(DDL_TINYINT);
                $$->fLength = DDLDatatypeLength[DDL_TINYINT];
                $$->fPrecision = 1;
        }
	| MEDIUMINT opt_display_width
	{
		$$ = new ColumnType(DDL_MEDINT);
		$$->fLength = DDLDatatypeLength[DDL_MEDINT];
	}
	| MEDIUMINT opt_display_width UNSIGNED
	{
		$$ = new ColumnType(DDL_UNSIGNED_MEDINT);
		$$->fLength = DDLDatatypeLength[DDL_UNSIGNED_MEDINT];
	}
	;
/* Bug 1570, change default scale to 0 from -1 */
opt_precision_scale:
	'(' ICONST ')' {$$ = new ColumnType(atoi($2), 0);}
	| '(' ICONST ',' ICONST ')' {$$ = new ColumnType(atoi($2), atoi($4));}
	| {$$ = new ColumnType(10,0);}
	;

opt_signed:
    SIGNED {$$ = NULL;}
    | {$$ = NULL;}

    opt_zerofill:
        ZEROFILL {$$ = NULL;}
        | {$$ = NULL;}

    opt_display_width:
        '(' ICONST ')' {$$ = NULL;}
        | {$$ = NULL;}
        ;

    approximate_numeric_type:
        DOUBLE opt_display_precision_scale_null
        {
            $$ = new ColumnType(DDL_DOUBLE);
            $$->fLength = DDLDatatypeLength[DDL_DOUBLE];
        }
        | DOUBLE opt_display_precision_scale_null UNSIGNED
        {
            $$ = new ColumnType(DDL_UNSIGNED_DOUBLE);
            $$->fLength = DDLDatatypeLength[DDL_DOUBLE];
        }
        | DOUBLE PRECISION opt_display_precision_scale_null
        {
            $$ = new ColumnType(DDL_DOUBLE);
            $$->fLength = DDLDatatypeLength[DDL_DOUBLE];
        }
        | DOUBLE PRECISION opt_display_precision_scale_null UNSIGNED
        {
            $$ = new ColumnType(DDL_UNSIGNED_DOUBLE);
            $$->fLength = DDLDatatypeLength[DDL_DOUBLE];
        }
        | REAL opt_display_precision_scale_null
        {
            $$ = new ColumnType(DDL_DOUBLE);
            $$->fLength = DDLDatatypeLength[DDL_DOUBLE];
        }
        | REAL opt_display_precision_scale_null UNSIGNED
        {
            $$ = new ColumnType(DDL_UNSIGNED_DOUBLE);
            $$->fLength = DDLDatatypeLength[DDL_DOUBLE];
        }
        | IDB_FLOAT opt_display_precision_scale_null
        {
            $$ = new ColumnType(DDL_FLOAT);
            $$->fLength = DDLDatatypeLength[DDL_FLOAT];
        }
        | IDB_FLOAT opt_display_precision_scale_null UNSIGNED
        {
            $$ = new ColumnType(DDL_UNSIGNED_FLOAT);
            $$->fLength = DDLDatatypeLength[DDL_FLOAT];
        }
        ;

    opt_display_precision_scale_null:
            '(' ICONST ')' {$$ = NULL;}
            |
            '(' ICONST ',' ICONST ')' {$$ = NULL;}
            | {$$ = NULL;}
            ;
            
    literal:
        ICONST
        | string_literal
        | FCONST
        ;

    datetime_type:
        DATETIME opt_time_precision
        {
            $$ = new ColumnType(DDL_DATETIME);
            $$->fLength = DDLDatatypeLength[DDL_DATETIME];
                    $$->fPrecision = $2;
        }
        |
        DATE
        {
            $$ = new ColumnType(DDL_DATE);
            $$->fLength = DDLDatatypeLength[DDL_DATE];
        }
        |
        TIME opt_time_precision
        {
            $$ = new ColumnType(DDL_TIME);
            $$->fLength = DDLDatatypeLength[DDL_TIME];
            $$->fPrecision = $2;
        }
        |
        TIMESTAMP opt_time_precision
        {
            $$ = new ColumnType(DDL_TIMESTAMP);
            $$->fLength = DDLDatatypeLength[DDL_TIMESTAMP];
            $$->fPrecision = $2;
        }

    opt_time_precision:
        '(' ICONST ')' {$$ = atoi($2);}
        | {$$ = -1;}
        ;

    drop_column_def:
        DROP column_name drop_behavior {$$ = new AtaDropColumn($2, $3);}
        | DROP COLUMN column_name drop_behavior {$$ = new AtaDropColumn($3, $4);}
        | DROP COLUMN '(' column_name_list ')' {$$ = new AtaDropColumns($4);}
        | DROP '(' column_name_list ')' {$$ = new AtaDropColumns($3);}
        | DROP COLUMNS '(' column_name_list ')' {$$ = new AtaDropColumns($4);}
        ;

    drop_behavior:
        CASCADE {$$ = DDL_CASCADE;}
        | RESTRICT {$$ = DDL_RESTRICT;}
        | {$$ = DDL_NO_ACTION;}
        ;

    alter_column_def:
        ALTER opt_column column_name SET default_clause {$$ = new AtaSetColumnDefault($3, $5);}
        | 	ALTER opt_column column_name DROP DEFAULT {$$ = new AtaDropColumnDefault($3);}
        ;

    opt_column:
        COLUMN
        |
        ;

    %%


