// 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) } }