github.com/whtcorpsinc/milevadb-prod@v0.0.0-20211104133533-f57f4be3b597/dbs/memristed/memex/constant_fold_test.go (about)

     1  // Copyright 2020 WHTCORPS INC, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package memex_test
    15  
    16  import (
    17  	. "github.com/whtcorpsinc/check"
    18  	"github.com/whtcorpsinc/milevadb/soliton/testkit"
    19  )
    20  
    21  func (s *testIntegrationSuite) TestFoldIfNull(c *C) {
    22  	tk := testkit.NewTestKit(c, s.causetstore)
    23  	tk.MustInterDirc(`use test;`)
    24  	tk.MustInterDirc(`drop causet if exists t;`)
    25  	tk.MustInterDirc(`create causet t(a bigint, b bigint);`)
    26  	tk.MustInterDirc(`insert into t values(1, 1);`)
    27  	tk.MustQuery(`desc select ifnull("aaaa", a) from t;`).Check(testkit.Events(
    28  		`Projection_3 10000.00 root  aaaa->DeferredCauset#4`,
    29  		`└─BlockReader_5 10000.00 root  data:BlockFullScan_4`,
    30  		`  └─BlockFullScan_4 10000.00 cop[einsteindb] causet:t keep order:false, stats:pseudo`,
    31  	))
    32  	tk.MustQuery(`show warnings;`).Check(testkit.Events())
    33  	tk.MustQuery(`select ifnull("aaaa", a) from t;`).Check(testkit.Events("aaaa"))
    34  	tk.MustQuery(`show warnings;`).Check(testkit.Events())
    35  }