From be6163c823285eb7bd048c8d0377c7b05dfd464e Mon Sep 17 00:00:00 2001
From: Brooks Liu <github.haoliu@gmail.com>
Date: Tue, 8 Oct 2019 15:49:01 +0800
Subject: [PATCH] expression: implement vectorized evaluation for
 `builtinRealIsFalseSig` (#12527)

---
 expression/builtin_op_vec.go      | 24 ++++++++++++++++++++++--
 expression/builtin_op_vec_test.go |  1 +
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/expression/builtin_op_vec.go b/expression/builtin_op_vec.go
index bbf3bd1788..06de2b0bfb 100644
--- a/expression/builtin_op_vec.go
+++ b/expression/builtin_op_vec.go
@@ -325,11 +325,31 @@ func (b *builtinBitAndSig) vecEvalInt(input *chunk.Chunk, result *chunk.Column)
 }
 
 func (b *builtinRealIsFalseSig) vectorized() bool {
-	return false
+	return true
 }
 
 func (b *builtinRealIsFalseSig) vecEvalInt(input *chunk.Chunk, result *chunk.Column) error {
-	return errors.Errorf("not implemented")
+	numRows := input.NumRows()
+	buf, err := b.bufAllocator.get(types.ETReal, numRows)
+	if err != nil {
+		return err
+	}
+	defer b.bufAllocator.put(buf)
+	if err := b.args[0].VecEvalReal(b.ctx, input, buf); err != nil {
+		return err
+	}
+
+	result.ResizeInt64(numRows, false)
+	i64s := result.Int64s()
+	bufI64s := buf.Int64s()
+	for i := 0; i < numRows; i++ {
+		if buf.IsNull(i) || bufI64s[i] != 0 {
+			i64s[i] = 0
+		} else {
+			i64s[i] = 1
+		}
+	}
+	return nil
 }
 
 func (b *builtinUnaryMinusIntSig) vectorized() bool {
diff --git a/expression/builtin_op_vec_test.go b/expression/builtin_op_vec_test.go
index d5578374de..c68869119c 100644
--- a/expression/builtin_op_vec_test.go
+++ b/expression/builtin_op_vec_test.go
@@ -27,6 +27,7 @@ var vecBuiltinOpCases = map[string][]vecExprBenchCase{
 		{retEvalType: types.ETInt, childrenTypes: []types.EvalType{types.ETDecimal}, geners: []dataGenerator{&defaultGener{0.2, types.ETDecimal}}},
 	},
 	ast.IsFalsity: {
+		{retEvalType: types.ETInt, childrenTypes: []types.EvalType{types.ETReal}},
 		{retEvalType: types.ETInt, childrenTypes: []types.EvalType{types.ETDecimal}},
 	},
 	ast.LogicOr: {