builtin_other_vec.go

// 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 (
	"strings"

	"github.com/pingcap/errors"
	"github.com/pingcap/tidb/types"
	"github.com/pingcap/tidb/util/chunk"
	"github.com/pingcap/tidb/util/stringutil"
)

func (b *builtinValuesIntSig) vectorized() bool {
	return false
}

func (b *builtinValuesIntSig) vecEvalInt(input *chunk.Chunk, result *chunk.Column) error {
	return errors.Errorf("not implemented")
}

func (b *builtinRowSig) vectorized() bool {
	return true
}

func (b *builtinRowSig) vecEvalString(input *chunk.Chunk, result *chunk.Column) error {
	panic("builtinRowSig.vecEvalString() should never be called.")
}

func (b *builtinValuesRealSig) vectorized() bool {
	return false
}

func (b *builtinValuesRealSig) vecEvalReal(input *chunk.Chunk, result *chunk.Column) error {
	return errors.Errorf("not implemented")
}

func (b *builtinValuesStringSig) vectorized() bool {
	return false
}

func (b *builtinValuesStringSig) vecEvalString(input *chunk.Chunk, result *chunk.Column) error {
	return errors.Errorf("not implemented")
}

func (b *builtinSetVarSig) vectorized() bool {
	return true
}

func (b *builtinSetVarSig) vecEvalString(input *chunk.Chunk, result *chunk.Column) error {
	n := input.NumRows()
	buf0, err := b.bufAllocator.get(types.ETString, n)
	if err != nil {
		return err
	}
	defer b.bufAllocator.put(buf0)
	if err := b.args[0].VecEvalString(b.ctx, input, buf0); err != nil {
		return err
	}
	buf1, err := b.bufAllocator.get(types.ETString, n)
	if err != nil {
		return err
	}
	defer b.bufAllocator.put(buf1)
	if err := b.args[1].VecEvalString(b.ctx, input, buf1); err != nil {
		return err
	}
	result.ReserveString(n)
	sessionVars := b.ctx.GetSessionVars()
	sessionVars.UsersLock.Lock()
	defer sessionVars.UsersLock.Unlock()
	for i := 0; i < n; i++ {
		if buf0.IsNull(i) || buf1.IsNull(i) {
			result.AppendNull()
			continue
		}
		varName := strings.ToLower(buf0.GetString(i))
		res := buf1.GetString(i)
		sessionVars.Users[varName] = stringutil.Copy(res)
		result.AppendString(res)
	}
	return nil
}

func (b *builtinGetVarSig) vectorized() bool {
	return true
}

func (b *builtinGetVarSig) vecEvalString(input *chunk.Chunk, result *chunk.Column) error {
	n := input.NumRows()
	buf0, err := b.bufAllocator.get(types.ETString, n)
	if err != nil {
		return err
	}
	defer b.bufAllocator.put(buf0)
	if err := b.args[0].VecEvalString(b.ctx, input, buf0); err != nil {
		return err
	}
	result.ReserveString(n)
	sessionVars := b.ctx.GetSessionVars()
	sessionVars.UsersLock.Lock()
	defer sessionVars.UsersLock.Unlock()
	for i := 0; i < n; i++ {
		if buf0.IsNull(i) {
			result.AppendNull()
			continue
		}
		varName := strings.ToLower(buf0.GetString(i))
		if v, ok := sessionVars.Users[varName]; ok {
			result.AppendString(v)
			continue
		}
		result.AppendNull()
	}
	return nil
}