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