// 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 kv import "github.com/pingcap/tipb/go-tipb" // RequestTypeSupportedChecker is used to check expression can be pushed down. type RequestTypeSupportedChecker struct{} // IsRequestTypeSupported checks whether reqType is supported. func (d RequestTypeSupportedChecker) IsRequestTypeSupported(reqType, subType int64) bool { switch reqType { case ReqTypeSelect, ReqTypeIndex: switch subType { case ReqSubTypeGroupBy, ReqSubTypeBasic, ReqSubTypeTopN: return true default: return d.supportExpr(tipb.ExprType(subType)) } case ReqTypeDAG: return d.supportExpr(tipb.ExprType(subType)) case ReqTypeAnalyze: return true } return false } func (d RequestTypeSupportedChecker) supportExpr(exprType tipb.ExprType) bool { switch exprType { case tipb.ExprType_Null, tipb.ExprType_Int64, tipb.ExprType_Uint64, tipb.ExprType_String, tipb.ExprType_Bytes, tipb.ExprType_MysqlDuration, tipb.ExprType_MysqlTime, tipb.ExprType_MysqlDecimal, tipb.ExprType_Float32, tipb.ExprType_Float64, tipb.ExprType_ColumnRef: return true // aggregate functions. case tipb.ExprType_Count, tipb.ExprType_First, tipb.ExprType_Max, tipb.ExprType_Min, tipb.ExprType_Sum, tipb.ExprType_Avg, tipb.ExprType_Agg_BitXor, tipb.ExprType_Agg_BitAnd, tipb.ExprType_Agg_BitOr, tipb.ExprType_ApproxCountDistinct: return true case ReqSubTypeDesc: return true case ReqSubTypeSignature: return true default: return false } }