77 lines
2.0 KiB
Go
77 lines
2.0 KiB
Go
// Copyright 2023 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package bindinfo
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import (
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"strings"
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"testing"
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"github.com/pingcap/tidb/pkg/parser"
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"github.com/pingcap/tidb/pkg/parser/ast"
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"github.com/pingcap/tidb/pkg/parser/format"
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"github.com/stretchr/testify/require"
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)
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func getTableName(n []*ast.TableName) []string {
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result := make([]string, 0, len(n))
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for _, v := range n {
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var sb strings.Builder
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restoreFlags := format.RestoreKeyWordLowercase
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restoreCtx := format.NewRestoreCtx(restoreFlags, &sb)
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v.Restore(restoreCtx)
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result = append(result, sb.String())
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}
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return result
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}
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func TestExtractTableName(t *testing.T) {
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tc := []struct {
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sql string
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tables []string
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}{
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{
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"select /*+ HASH_JOIN(t1, t2) */ * from t1 t1 join t1 t2 on t1.a=t2.a where t1.b is not null;",
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[]string{"t1", "t1"},
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},
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{
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"select * from t",
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[]string{"t"},
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},
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{
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"select * from t1, t2, t3;",
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[]string{"t1", "t2", "t3"},
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},
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{
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"select * from t1 where t1.a > (select max(a) from t2);",
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[]string{"t1", "t2"},
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},
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{
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"select * from t1 where t1.a > (select max(a) from t2 where t2.a > (select max(a) from t3));",
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[]string{"t1", "t2", "t3"},
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},
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{
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"select a,b,c,d,* from t1 where t1.a > (select max(a) from t2 where t2.a > (select max(a) from t3));",
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[]string{"t1", "t2", "t3"},
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},
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}
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for _, tt := range tc {
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stmt, err := parser.New().ParseOneStmt(tt.sql, "", "")
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require.NoError(t, err)
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rs := CollectTableNames(stmt)
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result := getTableName(rs)
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require.Equal(t, tt.tables, result)
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}
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}
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