[release-19.0] Fix routing rule query rewrite (#15253)

go/vt/vtgate/planbuilder/rewrite.go

@@ -70,6 +70,7 @@ func (r *rewriter) rewriteDown(cursor *sqlparser.Cursor) bool {
 			node.As = tableName.Name
 		}
 		// replace the table name with the original table
+		tableName.Qualifier = sqlparser.IdentifierCS{}
 		tableName.Name = vindexTable.Name
 		node.Expr = tableName
 	}

go/vt/vtgate/planbuilder/testdata/dml_cases.json

@@ -5550,5 +5550,78 @@
         "user.user"
       ]
     }
+  },
+  {
+    "comment": "Delete with routed table on music",
+    "query": "delete from second_user.bar",
+    "plan": {
+      "QueryType": "DELETE",
+      "Original": "delete from second_user.bar",
+      "Instructions": {
+        "OperatorType": "Delete",
+        "Variant": "Scatter",
+        "Keyspace": {
+          "Name": "user",
+          "Sharded": true
+        },
+        "TargetTabletType": "PRIMARY",
+        "KsidLength": 1,
+        "KsidVindex": "user_index",
+        "OwnedVindexQuery": "select user_id, id from music as bar for update",
+        "Query": "delete from music as bar",
+        "Table": "music"
+      },
+      "TablesUsed": [
+        "user.music"
+      ]
+    }
+  },
+  {
+    "comment": "Update with routed table on music",
+    "query": "update second_user.bar set col = 23",
+    "plan": {
+      "QueryType": "UPDATE",
+      "Original": "update second_user.bar set col = 23",
+      "Instructions": {
+        "OperatorType": "Update",
+        "Variant": "Scatter",
+        "Keyspace": {
+          "Name": "user",
+          "Sharded": true
+        },
+        "TargetTabletType": "PRIMARY",
+        "Query": "update music as bar set col = 23",
+        "Table": "music"
+      },
+      "TablesUsed": [
+        "user.music"
+      ]
+    }
+  },
+  {
+    "comment": "Insert with routed table on music",
+    "query": "insert into second_user.bar(id) values (2)",
+    "plan": {
+      "QueryType": "INSERT",
+      "Original": "insert into second_user.bar(id) values (2)",
+      "Instructions": {
+        "OperatorType": "Insert",
+        "Variant": "Sharded",
+        "Keyspace": {
+          "Name": "user",
+          "Sharded": true
+        },
+        "TargetTabletType": "PRIMARY",
+        "Query": "insert into music(id, user_id) values (:_id_0, :_user_id_0)",
+        "TableName": "music",
+        "VindexValues": {
+          "music_user_map": "2",
+          "user_index": "null"
+        }
+      },
+      "TablesUsed": [
+        "user.music"
+      ]
+    }
   }
 ]

go/vt/vtgate/planbuilder/testdata/select_cases.json

@@ -1573,6 +1573,28 @@
       ]
     }
   },
+  {
+    "comment": "routing table on music",
+    "query": "select * from second_user.bar where id > 2",
+    "plan": {
+      "QueryType": "SELECT",
+      "Original": "select * from second_user.bar where id > 2",
+      "Instructions": {
+        "OperatorType": "Route",
+        "Variant": "Scatter",
+        "Keyspace": {
+          "Name": "user",
+          "Sharded": true
+        },
+        "FieldQuery": "select * from music as bar where 1 != 1",
+        "Query": "select * from music as bar where id > 2",
+        "Table": "music"
+      },
+      "TablesUsed": [
+        "user.music"
+      ]
+    }
+  },
   {
     "comment": "testing SingleRow Projection",
     "query": "select 42",

go/vt/vtgate/planbuilder/testdata/vschemas/schema.json

@@ -25,6 +25,12 @@
           "user.user"
         ]
       },
+      {
+        "from_table": "second_user.bar",
+        "to_tables": [
+          "user.music"
+        ]
+      },
       {
         "from_table": "primary_redirect@primary",
         "to_tables": [
@@ -508,8 +514,7 @@
       "sharded": true,
       "vindexes": {
         "hash_dup": {
-          "type": "hash_test",
-          "owner": "user"
+          "type": "hash_test"
         }
       },
       "tables": {