expression: implement vectorized evaluation for builtinIfJSONSig (#…

…12081)

expression/bench_test.go

@@ -299,6 +299,9 @@ var vecExprBenchCases = map[string][]vecExprBenchCase{
 	ast.Log10: {
 		{types.ETReal, []types.EvalType{types.ETReal}, nil},
 	},
+	ast.If: {
+		{types.ETJson, []types.EvalType{types.ETInt, types.ETJson, types.ETJson}, nil},
+	},
 }
 
 func fillColumn(eType types.EvalType, chk *chunk.Chunk, colIdx int, testCase vecExprBenchCase) {
@@ -585,11 +588,13 @@ func (s *testEvaluatorSuite) TestVectorizedBuiltinFunc(c *C) {
 				c.Assert(err, IsNil)
 				vecWarnCnt = ctx.GetSessionVars().StmtCtx.WarningCount()
 				for row := it.Begin(); row != it.End(); row = it.Next() {
-					val, isNull, err := baseFunc.evalDuration(row)
+					val, isNull, err := baseFunc.evalJSON(row)
 					c.Assert(err, IsNil)
 					c.Assert(isNull, Equals, output.IsNull(i))
 					if !isNull {
-						c.Assert(val, Equals, output.GetJSON(i))
+						var cmp int
+						cmp = json.CompareBinary(val, output.GetJSON(i))
+						c.Assert(cmp, Equals, 0)
 					}
 					i++
 				}

expression/builtin_control_vec.go

@@ -0,0 +1,75 @@
+// 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 expression
+
+import (
+	"github.com/pingcap/tidb/types"
+	"github.com/pingcap/tidb/util/chunk"
+)
+
+func (b *builtinIfJSONSig) vecEvalJSON(input *chunk.Chunk, result *chunk.Column) error {
+	n := input.NumRows()
+	buf0, err := b.bufAllocator.get(types.ETInt, n)
+	if err != nil {
+		return err
+	}
+	defer b.bufAllocator.put(buf0)
+	if err := b.args[0].VecEvalInt(b.ctx, input, buf0); err != nil {
+		return err
+	}
+
+	buf1, err := b.bufAllocator.get(types.ETJson, n)
+	if err != nil {
+		return err
+	}
+	defer b.bufAllocator.put(buf1)
+	if err := b.args[1].VecEvalJSON(b.ctx, input, buf1); err != nil {
+		return err
+	}
+
+	buf2, err := b.bufAllocator.get(types.ETJson, n)
+	if err != nil {
+		return err
+	}
+	defer b.bufAllocator.put(buf2)
+	if err := b.args[2].VecEvalJSON(b.ctx, input, buf2); err != nil {
+		return err
+	}
+
+	result.ReserveJSON(n)
+	arg0 := buf0.Int64s()
+	for i := 0; i < n; i++ {
+		arg := arg0[i]
+		isNull0 := buf0.IsNull(i)
+		switch {
+		case isNull0 || arg == 0:
+			if buf2.IsNull(i) {
+				result.AppendNull()
+			} else {
+				result.AppendJSON(buf2.GetJSON(i))
+			}
+		case arg != 0:
+			if buf1.IsNull(i) {
+				result.AppendNull()
+			} else {
+				result.AppendJSON(buf1.GetJSON(i))
+			}
+		}
+	}
+	return nil
+}
+
+func (b *builtinIfJSONSig) vectorized() bool {
+	return true
+}