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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 aggfuncs_test
import (
. "github.com/pingcap/check"
"github.com/pingcap/parser/ast"
"github.com/pingcap/parser/mysql"
"github.com/pingcap/tidb/expression"
"github.com/pingcap/tidb/types"
)
func (s *testSuite) TestLeadLag(c *C) {
zero := expression.NewZero()
one := expression.NewOne()
two := &expression.Constant{
Value: types.NewDatum(2),
RetType: types.NewFieldType(mysql.TypeTiny),
}
three := &expression.Constant{
Value: types.NewDatum(3),
RetType: types.NewFieldType(mysql.TypeTiny),
}
million := &expression.Constant{
Value: types.NewDatum(1000000),
RetType: types.NewFieldType(mysql.TypeLong),
}
defaultArg := &expression.Column{RetType: types.NewFieldType(mysql.TypeLonglong), Index: 0}
numRows := 3
tests := []windowTest{
// lag(field0, N)
buildWindowTesterWithArgs(ast.WindowFuncLag, mysql.TypeLonglong,
[]expression.Expression{zero}, 0, numRows, 0, 1, 2),
buildWindowTesterWithArgs(ast.WindowFuncLag, mysql.TypeLonglong,
[]expression.Expression{one}, 0, numRows, nil, 0, 1),
buildWindowTesterWithArgs(ast.WindowFuncLag, mysql.TypeLonglong,
[]expression.Expression{two}, 0, numRows, nil, nil, 0),
buildWindowTesterWithArgs(ast.WindowFuncLag, mysql.TypeLonglong,
[]expression.Expression{three}, 0, numRows, nil, nil, nil),
buildWindowTesterWithArgs(ast.WindowFuncLag, mysql.TypeLonglong,
[]expression.Expression{million}, 0, numRows, nil, nil, nil),
// lag(field0, N, 1000000)
buildWindowTesterWithArgs(ast.WindowFuncLag, mysql.TypeLonglong,
[]expression.Expression{zero, million}, 0, numRows, 0, 1, 2),
buildWindowTesterWithArgs(ast.WindowFuncLag, mysql.TypeLonglong,
[]expression.Expression{one, million}, 0, numRows, 1000000, 0, 1),
buildWindowTesterWithArgs(ast.WindowFuncLag, mysql.TypeLonglong,
[]expression.Expression{two, million}, 0, numRows, 1000000, 1000000, 0),
buildWindowTesterWithArgs(ast.WindowFuncLag, mysql.TypeLonglong,
[]expression.Expression{three, million}, 0, numRows, 1000000, 1000000, 1000000),
buildWindowTesterWithArgs(ast.WindowFuncLag, mysql.TypeLonglong,
[]expression.Expression{million, million}, 0, numRows, 1000000, 1000000, 1000000),
// lag(field0, N, field0)
buildWindowTesterWithArgs(ast.WindowFuncLag, mysql.TypeLonglong,
[]expression.Expression{zero, defaultArg}, 0, numRows, 0, 1, 2),
buildWindowTesterWithArgs(ast.WindowFuncLag, mysql.TypeLonglong,
[]expression.Expression{one, defaultArg}, 0, numRows, 0, 0, 1),
buildWindowTesterWithArgs(ast.WindowFuncLag, mysql.TypeLonglong,
[]expression.Expression{two, defaultArg}, 0, numRows, 0, 1, 0),
buildWindowTesterWithArgs(ast.WindowFuncLag, mysql.TypeLonglong,
[]expression.Expression{three, defaultArg}, 0, numRows, 0, 1, 2),
buildWindowTesterWithArgs(ast.WindowFuncLag, mysql.TypeLonglong,
[]expression.Expression{million, defaultArg}, 0, numRows, 0, 1, 2),
// lead(field0, N)
buildWindowTesterWithArgs(ast.WindowFuncLead, mysql.TypeLonglong,
[]expression.Expression{zero}, 0, numRows, 0, 1, 2),
buildWindowTesterWithArgs(ast.WindowFuncLead, mysql.TypeLonglong,
[]expression.Expression{one}, 0, numRows, 1, 2, nil),
buildWindowTesterWithArgs(ast.WindowFuncLead, mysql.TypeLonglong,
[]expression.Expression{two}, 0, numRows, 2, nil, nil),
buildWindowTesterWithArgs(ast.WindowFuncLead, mysql.TypeLonglong,
[]expression.Expression{three}, 0, numRows, nil, nil, nil),
buildWindowTesterWithArgs(ast.WindowFuncLead, mysql.TypeLonglong,
[]expression.Expression{million}, 0, numRows, nil, nil, nil),
// lead(field0, N, 1000000)
buildWindowTesterWithArgs(ast.WindowFuncLead, mysql.TypeLonglong,
[]expression.Expression{zero, million}, 0, numRows, 0, 1, 2),
buildWindowTesterWithArgs(ast.WindowFuncLead, mysql.TypeLonglong,
[]expression.Expression{one, million}, 0, numRows, 1, 2, 1000000),
buildWindowTesterWithArgs(ast.WindowFuncLead, mysql.TypeLonglong,
[]expression.Expression{two, million}, 0, numRows, 2, 1000000, 1000000),
buildWindowTesterWithArgs(ast.WindowFuncLead, mysql.TypeLonglong,
[]expression.Expression{three, million}, 0, numRows, 1000000, 1000000, 1000000),
buildWindowTesterWithArgs(ast.WindowFuncLead, mysql.TypeLonglong,
[]expression.Expression{million, million}, 0, numRows, 1000000, 1000000, 1000000),
// lead(field0, N, field0)
buildWindowTesterWithArgs(ast.WindowFuncLead, mysql.TypeLonglong,
[]expression.Expression{zero, defaultArg}, 0, numRows, 0, 1, 2),
buildWindowTesterWithArgs(ast.WindowFuncLead, mysql.TypeLonglong,
[]expression.Expression{one, defaultArg}, 0, numRows, 1, 2, 2),
buildWindowTesterWithArgs(ast.WindowFuncLead, mysql.TypeLonglong,
[]expression.Expression{two, defaultArg}, 0, numRows, 2, 1, 2),
buildWindowTesterWithArgs(ast.WindowFuncLead, mysql.TypeLonglong,
[]expression.Expression{three, defaultArg}, 0, numRows, 0, 1, 2),
buildWindowTesterWithArgs(ast.WindowFuncLead, mysql.TypeLonglong,
[]expression.Expression{million, defaultArg}, 0, numRows, 0, 1, 2),
}
for _, test := range tests {
s.testWindowFunc(c, test)
}
}