parser: support show create database if not exists syntax (pingcap#148

) See: https://dev.mysql.com/doc/refman/5.7/en/show-create-database.html
tiancaiamao · Jan 3, 2019 · 9da90a0 · 9da90a0
1 parent 74964a2
commit 9da90a0
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diff --git a/ast/dml.go b/ast/dml.go
@@ -1317,13 +1317,14 @@ type ShowStmt struct {
  dmlNode
  resultSetNode
 
- Tp ShowStmtType // Databases/Tables/Columns/....
- DBName string
- Table *TableName // Used for showing columns.
- Column *ColumnName // Used for `desc table column`.
- Flag int // Some flag parsed from sql, such as FULL.
- Full bool
- User *auth.UserIdentity // Used for show grants.
+ Tp ShowStmtType // Databases/Tables/Columns/....
+ DBName string
+ Table *TableName // Used for showing columns.
+ Column *ColumnName // Used for `desc table column`.
+ Flag int // Some flag parsed from sql, such as FULL.
+ Full bool
+ User *auth.UserIdentity // Used for show grants.
+ IfNotExists bool // Used for `show create database if not exists`
 
  // GlobalScope is used by show variables
  GlobalScope bool