add alter column ast

Author: sjjian

ast/base.go

@@ -13,13 +13,51 @@ type Collation struct {
 	Name *element.Identifier
 }
 
-type SortProp bool
+type ColumnProp int
 
 const (
-	InvisiblePropInvisible = iota
-	InvisiblePropVisible
+	ColumnPropEmpty ColumnProp = iota
+	ColumnPropSort // for add column
+	ColumnPropInvisible
+	ColumnPropVisible
+	ColumnPropSubstitutable // for modify column
+	ColumnPropNotSubstitutable // for modify column
+	ColumnPropSubstitutableForce // for modify column
+	ColumnPropNotSubstitutableForce // for modify column
 )
 
-type InvisibleProp struct {
-	Type int
+type ColumnDefault struct {
+	OnNull bool
+	Value  interface{}
+}
+
+type ConstraintType int
+
+const (
+	ConstraintTypeNull ConstraintType = iota
+	ConstraintTypeNotNull
+	ConstraintTypeUnique
+	ConstraintTypePK
+	ConstraintTypeReferences
+)
+
+type ConstraintState int
+
+const (
+	ConstraintStateDeferrable ConstraintState = iota
+	ConstraintStateNotDeferrable
+	ConstraintStateInitiallyDeferred
+	ConstraintStateInitiallyImmediate
+	ConstraintStateRely
+	ConstraintStateNorely
+)
+
+type InlineConstraint struct {
+	Name   *element.Identifier
+	Type   ConstraintState
+	States []ConstraintState
+}
+
+type InlineReferences struct {
+	Scope TableName
 }

ast/ddl.go

@@ -18,29 +18,54 @@ type columnClause struct{}
 
 func (c *columnClause) IsColumnClause() {}
 
+type ColumnDef struct {
+	ColumnName *element.Identifier
+	Datatype   element.Datatype
+	Collation  *Collation
+	Props      []ColumnProp
+	Default    *ColumnDefault
+}
+
 type AddColumnClause struct {
 	columnClause
 	Columns []*ColumnDef
 }
 
-type ColumnDef struct {
-	ColumnName    *element.Identifier
-	Datatype      element.Datatype
-	Collation     *Collation
-	Sort          SortProp
-	InvisibleProp *InvisibleProp
-}
-
 type ModifyColumnClause struct {
 	columnClause
+	Columns []*ColumnDef
 }
 
+type DropColumnType int
+
+const (
+	DropColumnTypeDrop DropColumnType = iota
+	DropColumnTypeSetUnused
+	DropColumnTypeDropUnusedColumns
+	DropColumnTypeDropColumnsContinue
+)
+
+type DropColumnProp int
+
+const (
+	DropColumnPropEmpty DropColumnProp = iota
+	DropColumnPropCascade
+	DropColumnPropInvalidate
+	DropColumnPropOnline
+)
+
 type DropColumnClause struct {
 	columnClause
+	Type       DropColumnType
+	Columns    []*element.Identifier
+	Props      []DropColumnProp
+	CheckPoint *int
 }
 
 type RenameColumnClause struct {
 	columnClause
+	OldName *element.Identifier
+	NewName *element.Identifier
 }
 
 type CreateTableStmt struct {