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// Copyright 2019 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package expression_test
import (
. "github.com/pingcap/check"
"github.com/pingcap/tidb/util/testkit"
)
func (s *testIntegrationSuite) TestFoldIfNull(c *C) {
tk := testkit.NewTestKit(c, s.store)
tk.MustExec(`use test;`)
tk.MustExec(`drop table if exists t;`)
tk.MustExec(`create table t(a bigint, b bigint);`)
tk.MustExec(`insert into t values(1, 1);`)
tk.MustQuery(`desc select ifnull("aaaa", a) from t;`).Check(testkit.Rows(
`Projection_3 10000.00 root aaaa->Column#4`,
`└─TableReader_5 10000.00 root data:TableFullScan_4`,
` └─TableFullScan_4 10000.00 cop[tikv] table:t keep order:false, stats:pseudo`,
))
tk.MustQuery(`show warnings;`).Check(testkit.Rows())
tk.MustQuery(`select ifnull("aaaa", a) from t;`).Check(testkit.Rows("aaaa"))
tk.MustQuery(`show warnings;`).Check(testkit.Rows())
}