feat: implement drop-trigger statement

ast/ddl.go

@@ -15,6 +15,7 @@ package ast
 
 import (
 	"github.com/pingcap/errors"
+
 	"github.com/arana-db/parser/auth"
 	"github.com/arana-db/parser/format"
 	"github.com/arana-db/parser/model"
@@ -35,6 +36,7 @@ var (
 	_ DDLNode = &CreateSequenceStmt{}
 	_ DDLNode = &CreatePlacementPolicyStmt{}
 	_ DDLNode = &DropDatabaseStmt{}
+	_ DDLNode = &DropTriggerStmt{}
 	_ DDLNode = &DropIndexStmt{}
 	_ DDLNode = &DropTableStmt{}
 	_ DDLNode = &DropSequenceStmt{}
@@ -221,6 +223,37 @@ func (n *AlterDatabaseStmt) isAllPlacementOptions() bool {
 	return true
 }
 
+// DropTriggerStmt is a statement to drop a trigger in the database.
+// See https://dev.mysql.com/doc/refman/5.7/en/drop-trigger.html
+type DropTriggerStmt struct {
+	ddlNode
+
+	IfExists bool
+	Trigger  *TableName
+}
+
+// Restore implements Node interface.
+func (n *DropTriggerStmt) Restore(ctx *format.RestoreCtx) error {
+	ctx.WriteKeyWord("DROP TRIGGER ")
+	if n.IfExists {
+		ctx.WriteKeyWord("IF EXISTS ")
+	}
+	if err := n.Trigger.Restore(ctx); err != nil {
+		return errors.Annotate(err, "An error occurred while splicing DropTriggerStmt")
+	}
+	return nil
+}
+
+// Accept implements Node Accept interface.
+func (n *DropTriggerStmt) Accept(v Visitor) (Node, bool) {
+	newNode, skipChildren := v.Enter(n)
+	if skipChildren {
+		return v.Leave(newNode)
+	}
+	n = newNode.(*DropTriggerStmt)
+	return v.Leave(n)
+}
+
 // DropDatabaseStmt is a statement to drop a database and all tables in the database.
 // See https://dev.mysql.com/doc/refman/5.7/en/drop-database.html
 type DropDatabaseStmt struct {

ast/ddl_test.go

@@ -36,6 +36,7 @@ func TestDDLVisitorCover(t *testing.T) {
 		{&CreateDatabaseStmt{}, 0, 0},
 		{&AlterDatabaseStmt{}, 0, 0},
 		{&DropDatabaseStmt{}, 0, 0},
+		{&DropTriggerStmt{}, 0, 0},
 		{&DropIndexStmt{Table: &TableName{}}, 0, 0},
 		{&DropTableStmt{Tables: []*TableName{{}, {}}}, 0, 0},
 		{&RenameTableStmt{TableToTables: []*TableToTable{}}, 0, 0},

ast/dml.go

@@ -16,11 +16,11 @@ package ast
 import (
 	"strings"
 
-	"github.com/pingcap/errors"
 	"github.com/arana-db/parser/auth"
 	"github.com/arana-db/parser/format"
 	"github.com/arana-db/parser/model"
 	"github.com/arana-db/parser/mysql"
+	"github.com/pingcap/errors"
 )
 
 var (

ast/expressions.go

@@ -20,10 +20,10 @@ import (
 	"regexp"
 	"strings"
 
-	"github.com/pingcap/errors"
 	"github.com/arana-db/parser/format"
 	"github.com/arana-db/parser/model"
 	"github.com/arana-db/parser/opcode"
+	"github.com/pingcap/errors"
 )
 
 var (

ast/functions.go

@@ -19,10 +19,10 @@ import (
 	"strings"
 	"time"
 
-	"github.com/pingcap/errors"
 	"github.com/arana-db/parser/format"
 	"github.com/arana-db/parser/model"
 	"github.com/arana-db/parser/types"
+	"github.com/pingcap/errors"
 )
 
 var (

ast/misc.go

@@ -20,12 +20,12 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/pingcap/errors"
 	"github.com/arana-db/parser/auth"
 	"github.com/arana-db/parser/charset"
 	"github.com/arana-db/parser/format"
 	"github.com/arana-db/parser/model"
 	"github.com/arana-db/parser/mysql"
+	"github.com/pingcap/errors"
 )
 
 var (

ast/stats.go

@@ -14,9 +14,9 @@
 package ast
 
 import (
-	"github.com/pingcap/errors"
 	"github.com/arana-db/parser/format"
 	"github.com/arana-db/parser/model"
+	"github.com/pingcap/errors"
 )
 
 var (

auth/mysql_native_password.go

@@ -19,8 +19,8 @@ import (
 	"encoding/hex"
 	"fmt"
 
-	"github.com/pingcap/errors"
 	"github.com/arana-db/parser/terror"
+	"github.com/pingcap/errors"
 )
 
 // CheckScrambledPassword check scrambled password received from client.

charset/charset.go

@@ -17,10 +17,10 @@ import (
 	"sort"
 	"strings"
 
-	"github.com/pingcap/errors"
-	"github.com/pingcap/log"
 	"github.com/arana-db/parser/mysql"
 	"github.com/arana-db/parser/terror"
+	"github.com/pingcap/errors"
+	"github.com/pingcap/log"
 	"go.uber.org/zap"
 )
 

go.mod

@@ -1,3 +1,5 @@
+go 1.13
+
 module github.com/arana-db/parser
 
 require (
@@ -14,5 +16,3 @@ require (
 	modernc.org/parser v1.0.2
 	modernc.org/y v1.0.1
 )
-
-go 1.13

goyacc/format_yacc.go

@@ -23,9 +23,9 @@ import (
 	"regexp"
 	"strings"
 
+	"github.com/arana-db/parser/format"
 	"github.com/cznic/strutil"
 	"github.com/pingcap/errors"
-	"github.com/arana-db/parser/format"
 	parser "modernc.org/parser/yacc"
 )
 

model/ddl.go

@@ -20,9 +20,9 @@ import (
 	"sync"
 	"time"
 
-	"github.com/pingcap/errors"
 	"github.com/arana-db/parser/mysql"
 	"github.com/arana-db/parser/terror"
+	"github.com/pingcap/errors"
 )
 
 // ActionType is the type for DDL action.

model/model.go

@@ -20,11 +20,11 @@ import (
 	"strings"
 	"time"
 
-	"github.com/pingcap/errors"
 	"github.com/arana-db/parser/auth"
 	"github.com/arana-db/parser/charset"
 	"github.com/arana-db/parser/mysql"
 	"github.com/arana-db/parser/types"
+	"github.com/pingcap/errors"
 )
 
 // SchemaState is the state for schema elements.

mysql/const.go

@@ -18,6 +18,7 @@ import (
 	"strings"
 
 	"github.com/pingcap/errors"
+
 	"github.com/arana-db/parser/format"
 )