🐛 fix commna separate join tables info

  select * from t1, t2 limit 1

ast/testdata/TestSchemaMetaInfo.golden

@@ -6,6 +6,8 @@ syntax error case
 []
 select * from ta join tb using (id)
 [`sakila`.`ta` `sakila`.`tb`]
+select * from ta, tb limit 1
+[`sakila`.`ta` `sakila`.`tb`]
 SELECT * FROM film WHERE length = 86;
 [`sakila`.`film`]
 SELECT * FROM film WHERE length IS NULL;
@@ -117,9 +119,9 @@ DELETE FROM film WHERE length > 100;
 UPDATE city INNER JOIN country USING(country_id) SET city.city = 'Abha', city.last_update = '2006-02-15 04:45:25', country.country = 'Afghanistan' WHERE city.city_id=10;
 [`sakila`.`city` `sakila`.`country`]
 UPDATE city INNER JOIN country ON city.country_id = country.country_id INNER JOIN address ON city.city_id = address.city_id SET city.city = 'Abha', city.last_update = '2006-02-15 04:45:25', country.country = 'Afghanistan' WHERE city.city_id=10;
-[`sakila`.`address`]
+[`sakila`.`address` `sakila`.`city` `sakila`.`country`]
 UPDATE city, country SET city.city = 'Abha', city.last_update = '2006-02-15 04:45:25', country.country = 'Afghanistan' WHERE city.country_id = country.country_id AND city.city_id=10;
-[`sakila`.`country`]
+[`sakila`.`city` `sakila`.`country`]
 UPDATE film SET length = 10 WHERE language_id = 20;
 [`sakila`.`film`]
 INSERT INTO city (country_id) SELECT country_id FROM country;

ast/tidb.go

@@ -86,32 +86,20 @@ func SchemaMetaInfo(sql string, defaultDatabase string) []string {
 			tables = append(tables, fmt.Sprintf("`%s`.`dual`", n.DBName))
 		case *ast.InsertStmt, *ast.SelectStmt, *ast.UnionStmt, *ast.UpdateStmt, *ast.DeleteStmt:
 			// DML/DQL: INSERT, SELECT, UPDATE, DELETE
-			tableRefs := common.JSONFind(jsonString, "TableRefs")
-			for _, table := range tableRefs {
-				leftDatabase := gjson.Get(table, "Left.Source.Schema.O")
-				leftTable := gjson.Get(table, "Left.Source.Name.O")
-				if leftDatabase.String() == "" {
-					if leftTable.String() != "" {
-						tables = append(tables, fmt.Sprintf("`%s`.`%s`", defaultDatabase, leftTable))
-					}
-				} else {
-					if leftTable.String() != "" {
-						tables = append(tables, fmt.Sprintf("`%s`.`%s`", leftDatabase, leftTable))
-					} else {
-						tables = append(tables, fmt.Sprintf("`%s`.`dual`", leftDatabase))
-					}
-				}
-				rightDatabase := gjson.Get(table, "Right.Source.Schema.O")
-				rightTable := gjson.Get(table, "Right.Source.Name.O")
-				if rightDatabase.String() == "" {
-					if rightTable.String() != "" {
-						tables = append(tables, fmt.Sprintf("`%s`.`%s`", defaultDatabase, rightTable))
-					}
-				} else {
-					if rightTable.String() != "" {
-						tables = append(tables, fmt.Sprintf("`%s`.`%s`", rightDatabase, rightTable))
+			for _, tableRef := range common.JSONFind(jsonString, "TableRefs") {
+				for _, source := range common.JSONFind(tableRef, "Source") {
+					database := gjson.Get(source, "Schema.O")
+					table := gjson.Get(source, "Name.O")
+					if database.String() == "" {
+						if table.String() != "" {
+							tables = append(tables, fmt.Sprintf("`%s`.`%s`", defaultDatabase, table))
+						}
 					} else {
-						tables = append(tables, fmt.Sprintf("`%s`.`dual`", rightDatabase))
+						if table.String() != "" {
+							tables = append(tables, fmt.Sprintf("`%s`.`%s`", database, table))
+						} else {
+							tables = append(tables, fmt.Sprintf("`%s`.`dual`", database))
+						}
 					}
 				}
 			}

ast/tidb_test.go

@@ -64,6 +64,7 @@ func TestSchemaMetaInfo(t *testing.T) {
 		"select 1;",
 		"syntax error case",
 		"select * from ta join tb using (id)",
+		"select * from ta, tb limit 1",
 	}
 	err := common.GoldenDiff(func() {
 		for _, sql := range append(sqls, common.TestSQLs...) {

test/fixture/test_Check_get_tables_from_SQL.golden

@@ -204,7 +204,9 @@
     "`hello`.`t`"
   ],
   "C15BDF2C73B5B7ED": [
-    "`unknown`.`address`"
+    "`unknown`.`address`",
+    "`unknown`.`city`",
+    "`unknown`.`country`"
   ],
   "C315BC4EE0F4E523": [
     "`unknown`.inventory`"
@@ -262,6 +264,7 @@
     "`unknown`.`country`"
   ],
   "FCD1ABF36F8CDAD7": [
+    "`unknown`.`city`",
     "`unknown`.`country`"
   ],
   "FE409EB794EE91CF": [
@@ -474,7 +477,9 @@
     "`hello`.`t`"
   ],
   "C15BDF2C73B5B7ED": [
-    "`sakila`.`address`"
+    "`sakila`.`address`",
+    "`sakila`.`city`",
+    "`sakila`.`country`"
   ],
   "C315BC4EE0F4E523": [
     "`sakila`.inventory`"
@@ -532,6 +537,7 @@
     "`sakila`.`country`"
   ],
   "FCD1ABF36F8CDAD7": [
+    "`sakila`.`city`",
     "`sakila`.`country`"
   ],
   "FE409EB794EE91CF": [