Function isStmtImplemented

internal/sql/catalog/table.go:164–184

(stmt *ast.AlterTableStmt)

}

func isStmtImplemented(stmt *ast.AlterTableStmt) bool {
	var implemented bool
	for _, item := range stmt.Cmds.Items {
		switch cmd := item.(type) {
		case *ast.AlterTableCmd:
			switch cmd.Subtype {
			case ast.AT_AddColumn:
				implemented = true
			case ast.AT_AlterColumnType:
				implemented = true
			case ast.AT_DropColumn:
				implemented = true
			case ast.AT_DropNotNull:
				implemented = true
			case ast.AT_SetNotNull:
				implemented = true
			}
		}
	}
	return implemented
}

func (c *Catalog) alterTable(stmt *ast.AlterTableStmt) error {
	if !isStmtImplemented(stmt) {