36 lines
1.3 KiB
Go
36 lines
1.3 KiB
Go
// Copyright 2019 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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// See the License for the specific language governing permissions and
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// limitations under the License.
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package expression_test
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import (
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. "github.com/pingcap/check"
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"github.com/pingcap/tidb/util/testkit"
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)
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func (s *testIntegrationSuite) TestFoldIfNull(c *C) {
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tk := testkit.NewTestKit(c, s.store)
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tk.MustExec(`use test;`)
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tk.MustExec(`drop table if exists t;`)
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tk.MustExec(`create table t(a bigint, b bigint);`)
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tk.MustExec(`insert into t values(1, 1);`)
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tk.MustQuery(`desc select ifnull("aaaa", a) from t;`).Check(testkit.Rows(
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`Projection_3 10000.00 root "aaaa"`,
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`└─TableReader_5 10000.00 root data:TableScan_4`,
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` └─TableScan_4 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo`,
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))
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tk.MustQuery(`show warnings;`).Check(testkit.Rows())
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tk.MustQuery(`select ifnull("aaaa", a) from t;`).Check(testkit.Rows("aaaa"))
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tk.MustQuery(`show warnings;`).Check(testkit.Rows())
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}
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