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JoinInterpreterHelper.cpp
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JoinInterpreterHelper.cpp
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// Copyright 2022 PingCAP, Ltd.
//
// 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <Common/TiFlashException.h>
#include <DataStreams/ExpressionBlockInputStream.h>
#include <DataTypes/DataTypeNullable.h>
#include <DataTypes/DataTypeString.h>
#include <DataTypes/getLeastSupertype.h>
#include <Flash/Coprocessor/DAGExpressionAnalyzer.h>
#include <Flash/Coprocessor/DAGUtils.h>
#include <Flash/Coprocessor/JoinInterpreterHelper.h>
#include <Interpreters/Context.h>
#include <Interpreters/Join.h>
#include <Storages/Transaction/TypeMapping.h>
#include <fmt/format.h>
#include <unordered_map>
namespace DB
{
namespace ErrorCodes
{
extern const int NO_COMMON_TYPE;
} // namespace ErrorCodes
namespace JoinInterpreterHelper
{
namespace
{
std::pair<ASTTableJoin::Kind, size_t> getJoinKindAndBuildSideIndex(const tipb::Join & join)
{
static const std::unordered_map<tipb::JoinType, ASTTableJoin::Kind> equal_join_type_map{
{tipb::JoinType::TypeInnerJoin, ASTTableJoin::Kind::Inner},
{tipb::JoinType::TypeLeftOuterJoin, ASTTableJoin::Kind::Left},
{tipb::JoinType::TypeRightOuterJoin, ASTTableJoin::Kind::Right},
{tipb::JoinType::TypeSemiJoin, ASTTableJoin::Kind::Inner},
{tipb::JoinType::TypeAntiSemiJoin, ASTTableJoin::Kind::Anti},
{tipb::JoinType::TypeLeftOuterSemiJoin, ASTTableJoin::Kind::LeftSemi},
{tipb::JoinType::TypeAntiLeftOuterSemiJoin, ASTTableJoin::Kind::LeftAnti}};
static const std::unordered_map<tipb::JoinType, ASTTableJoin::Kind> cartesian_join_type_map{
{tipb::JoinType::TypeInnerJoin, ASTTableJoin::Kind::Cross},
{tipb::JoinType::TypeLeftOuterJoin, ASTTableJoin::Kind::Cross_Left},
{tipb::JoinType::TypeRightOuterJoin, ASTTableJoin::Kind::Cross_Right},
{tipb::JoinType::TypeSemiJoin, ASTTableJoin::Kind::Cross},
{tipb::JoinType::TypeAntiSemiJoin, ASTTableJoin::Kind::Cross_Anti},
{tipb::JoinType::TypeLeftOuterSemiJoin, ASTTableJoin::Kind::Cross_LeftSemi},
{tipb::JoinType::TypeAntiLeftOuterSemiJoin, ASTTableJoin::Kind::Cross_LeftAnti}};
const auto & join_type_map = join.left_join_keys_size() == 0 ? cartesian_join_type_map : equal_join_type_map;
auto join_type_it = join_type_map.find(join.join_type());
if (unlikely(join_type_it == join_type_map.end()))
throw TiFlashException("Unknown join type in dag request", Errors::Coprocessor::BadRequest);
ASTTableJoin::Kind kind = join_type_it->second;
/// in DAG request, inner part is the build side, however for TiFlash implementation,
/// the build side must be the right side, so need to swap the join side if needed
/// 1. for (cross) inner join, there is no problem in this swap.
/// 2. for (cross) semi/anti-semi join, the build side is always right, needn't swap.
/// 3. for non-cross left/right join, there is no problem in this swap.
/// 4. for cross left join, the build side is always right, needn't and can't swap.
/// 5. for cross right join, the build side is always left, so it will always swap and change to cross left join.
/// note that whatever the build side is, we can't support cross-right join now.
size_t build_side_index = 0;
switch (kind)
{
case ASTTableJoin::Kind::Cross_Right:
build_side_index = 0;
break;
case ASTTableJoin::Kind::Cross_Left:
build_side_index = 1;
break;
default:
build_side_index = join.inner_idx();
}
assert(build_side_index == 0 || build_side_index == 1);
// should swap join side.
if (build_side_index != 1)
{
switch (kind)
{
case ASTTableJoin::Kind::Left:
kind = ASTTableJoin::Kind::Right;
break;
case ASTTableJoin::Kind::Right:
kind = ASTTableJoin::Kind::Left;
break;
case ASTTableJoin::Kind::Cross_Right:
kind = ASTTableJoin::Kind::Cross_Left;
default:; // just `default`, for other kinds, don't need to change kind.
}
}
return {kind, build_side_index};
}
JoinKeyType geCommonTypeForJoinOn(const DataTypePtr & left_type, const DataTypePtr & right_type)
{
try
{
return {getLeastSupertype({left_type, right_type}), false};
}
catch (DB::Exception & e)
{
if (e.code() == ErrorCodes::NO_COMMON_TYPE
&& removeNullable(left_type)->isDecimal()
&& removeNullable(right_type)->isDecimal())
{
// fix https://github.com/pingcap/tiflash/issues/4519
// String is the common type for all types, it is always safe to choose String.
// But then we need to use `FunctionFormatDecimal` to format decimal.
// For example 0.1000000000 is equal to 0.10000000000000000000, but the original strings are not equal.
RUNTIME_ASSERT(!left_type->onlyNull() || !right_type->onlyNull());
auto fall_back_type = std::make_shared<DataTypeString>();
bool make_nullable = left_type->isNullable() || right_type->isNullable();
return {make_nullable ? makeNullable(fall_back_type) : fall_back_type, true};
}
else
{
throw;
}
}
}
JoinKeyTypes getJoinKeyTypes(const tipb::Join & join)
{
if (unlikely(join.left_join_keys_size() != join.right_join_keys_size()))
throw TiFlashException("size of join.left_join_keys != size of join.right_join_keys", Errors::Coprocessor::BadRequest);
JoinKeyTypes join_key_types;
for (int i = 0; i < join.left_join_keys_size(); ++i)
{
if (unlikely(!exprHasValidFieldType(join.left_join_keys(i)) || !exprHasValidFieldType(join.right_join_keys(i))))
throw TiFlashException("Join key without field type", Errors::Coprocessor::BadRequest);
auto left_type = getDataTypeByFieldTypeForComputingLayer(join.left_join_keys(i).field_type());
auto right_type = getDataTypeByFieldTypeForComputingLayer(join.right_join_keys(i).field_type());
join_key_types.emplace_back(geCommonTypeForJoinOn(left_type, right_type));
}
return join_key_types;
}
TiDB::TiDBCollators getJoinKeyCollators(const tipb::Join & join, const JoinKeyTypes & join_key_types)
{
TiDB::TiDBCollators collators;
size_t join_key_size = join_key_types.size();
if (join.probe_types_size() == static_cast<int>(join_key_size) && join.build_types_size() == join.probe_types_size())
for (size_t i = 0; i < join_key_size; ++i)
{
// Don't need to check the collate for decimal format string.
if (removeNullable(join_key_types[i].key_type)->isString() && !join_key_types[i].is_incompatible_decimal)
{
if (unlikely(join.probe_types(i).collate() != join.build_types(i).collate()))
throw TiFlashException("Join with different collators on the join key", Errors::Coprocessor::BadRequest);
collators.push_back(getCollatorFromFieldType(join.probe_types(i)));
}
else
collators.push_back(nullptr);
}
return collators;
}
std::tuple<ExpressionActionsPtr, String, String> doGenJoinOtherConditionAction(
const Context & context,
const tipb::Join & join,
const NamesAndTypes & source_columns)
{
if (join.other_conditions_size() == 0 && join.other_eq_conditions_from_in_size() == 0)
return {nullptr, "", ""};
DAGExpressionAnalyzer dag_analyzer(source_columns, context);
ExpressionActionsChain chain;
String filter_column_for_other_condition;
if (join.other_conditions_size() > 0)
{
std::vector<const tipb::Expr *> condition_vector;
for (const auto & c : join.other_conditions())
{
condition_vector.push_back(&c);
}
filter_column_for_other_condition = dag_analyzer.appendWhere(chain, condition_vector);
}
String filter_column_for_other_eq_condition;
if (join.other_eq_conditions_from_in_size() > 0)
{
std::vector<const tipb::Expr *> condition_vector;
for (const auto & c : join.other_eq_conditions_from_in())
{
condition_vector.push_back(&c);
}
filter_column_for_other_eq_condition = dag_analyzer.appendWhere(chain, condition_vector);
}
return {chain.getLastActions(), std::move(filter_column_for_other_condition), std::move(filter_column_for_other_eq_condition)};
}
} // namespace
TiFlashJoin::TiFlashJoin(const tipb::Join & join_) // NOLINT(cppcoreguidelines-pro-type-member-init)
: join(join_)
, join_key_types(getJoinKeyTypes(join_))
, join_key_collators(getJoinKeyCollators(join_, join_key_types))
{
std::tie(kind, build_side_index) = getJoinKindAndBuildSideIndex(join);
strictness = isSemiJoin() ? ASTTableJoin::Strictness::Any : ASTTableJoin::Strictness::All;
}
String TiFlashJoin::genMatchHelperName(const Block & header1, const Block & header2) const
{
if (!isLeftSemiFamily())
{
return "";
}
size_t i = 0;
String match_helper_name = fmt::format("{}{}", Join::match_helper_prefix, i);
while (header1.has(match_helper_name) || header2.has(match_helper_name))
{
match_helper_name = fmt::format("{}{}", Join::match_helper_prefix, ++i);
}
return match_helper_name;
}
NamesAndTypes TiFlashJoin::genColumnsForOtherJoinFilter(
const Block & left_input_header,
const Block & right_input_header,
const ExpressionActionsPtr & probe_prepare_join_actions) const
{
#ifndef NDEBUG
auto is_prepare_actions_valid = [](const Block & origin_block, const ExpressionActionsPtr & prepare_actions) {
const Block & prepare_sample_block = prepare_actions->getSampleBlock();
for (const auto & p : origin_block)
{
if (!prepare_sample_block.has(p.name))
return false;
}
return true;
};
if (unlikely(!is_prepare_actions_valid(build_side_index == 1 ? left_input_header : right_input_header, probe_prepare_join_actions)))
{
throw TiFlashException("probe_prepare_join_actions isn't valid", Errors::Coprocessor::Internal);
}
#endif
/// columns_for_other_join_filter is a vector of columns used
/// as the input columns when compiling other join filter.
/// Note the order in the column vector is very important:
/// first the columns in left_input_header, then followed
/// by the columns in right_input_header, if there are other
/// columns generated before compile other join filter, then
/// append the extra columns afterwards. In order to figure out
/// whether a given column is already in the column vector or
/// not quickly, we use another set to store the column names.
/// The order of columns must be {left_input, right_input, extra columns},
/// because tidb requires the input schema of join to be {left_input, right_input}.
/// Extra columns are appended to prevent extra columns from being repeatedly generated.
NamesAndTypes columns_for_other_join_filter;
std::unordered_set<String> column_set_for_origin_columns;
auto append_origin_columns = [&columns_for_other_join_filter, &column_set_for_origin_columns](const Block & header, bool make_nullable) {
for (const auto & p : header)
{
columns_for_other_join_filter.emplace_back(p.name, make_nullable ? makeNullable(p.type) : p.type);
column_set_for_origin_columns.emplace(p.name);
}
};
append_origin_columns(left_input_header, join.join_type() == tipb::JoinType::TypeRightOuterJoin);
append_origin_columns(right_input_header, join.join_type() == tipb::JoinType::TypeLeftOuterJoin);
/// append the columns generated by probe side prepare join actions.
/// the new columns are
/// - filter_column and related temporary columns
/// - join keys and related temporary columns
auto append_new_columns = [&columns_for_other_join_filter, &column_set_for_origin_columns](const Block & header, bool make_nullable) {
for (const auto & p : header)
{
if (column_set_for_origin_columns.find(p.name) == column_set_for_origin_columns.end())
columns_for_other_join_filter.emplace_back(p.name, make_nullable ? makeNullable(p.type) : p.type);
}
};
bool make_nullable = build_side_index == 1
? join.join_type() == tipb::JoinType::TypeRightOuterJoin
: join.join_type() == tipb::JoinType::TypeLeftOuterJoin;
append_new_columns(probe_prepare_join_actions->getSampleBlock(), make_nullable);
return columns_for_other_join_filter;
}
/// all the columns from build side streams should be added after join, even for the join key.
NamesAndTypesList TiFlashJoin::genColumnsAddedByJoin(
const Block & build_side_header,
const String & match_helper_name) const
{
NamesAndTypesList columns_added_by_join;
bool make_nullable = isTiFlashLeftJoin();
for (auto const & p : build_side_header)
{
columns_added_by_join.emplace_back(p.name, make_nullable ? makeNullable(p.type) : p.type);
}
if (!match_helper_name.empty())
{
columns_added_by_join.emplace_back(match_helper_name, Join::match_helper_type);
}
return columns_added_by_join;
}
NamesAndTypes TiFlashJoin::genJoinOutputColumns(
const Block & left_input_header,
const Block & right_input_header,
const String & match_helper_name) const
{
NamesAndTypes join_output_columns;
auto append_output_columns = [&join_output_columns](const Block & header, bool make_nullable) {
for (auto const & p : header)
{
join_output_columns.emplace_back(p.name, make_nullable ? makeNullable(p.type) : p.type);
}
};
append_output_columns(left_input_header, join.join_type() == tipb::JoinType::TypeRightOuterJoin);
if (!isSemiJoin())
{
/// for semi join, the columns from right table will be ignored
append_output_columns(right_input_header, join.join_type() == tipb::JoinType::TypeLeftOuterJoin);
}
if (!match_helper_name.empty())
{
join_output_columns.emplace_back(match_helper_name, Join::match_helper_type);
}
return join_output_columns;
}
std::tuple<ExpressionActionsPtr, String, String> TiFlashJoin::genJoinOtherConditionAction(
const Context & context,
const Block & left_input_header,
const Block & right_input_header,
const ExpressionActionsPtr & probe_side_prepare_join) const
{
auto columns_for_other_join_filter
= genColumnsForOtherJoinFilter(
left_input_header,
right_input_header,
probe_side_prepare_join);
return doGenJoinOtherConditionAction(context, join, columns_for_other_join_filter);
}
std::tuple<ExpressionActionsPtr, Names, String> prepareJoin(
const Context & context,
const Block & input_header,
const google::protobuf::RepeatedPtrField<tipb::Expr> & keys,
const JoinKeyTypes & join_key_types,
bool left,
bool is_right_out_join,
const google::protobuf::RepeatedPtrField<tipb::Expr> & filters)
{
NamesAndTypes source_columns;
for (auto const & p : input_header)
source_columns.emplace_back(p.name, p.type);
DAGExpressionAnalyzer dag_analyzer(std::move(source_columns), context);
ExpressionActionsChain chain;
Names key_names;
String filter_column_name;
dag_analyzer.appendJoinKeyAndJoinFilters(chain, keys, join_key_types, key_names, left, is_right_out_join, filters, filter_column_name);
return {chain.getLastActions(), std::move(key_names), std::move(filter_column_name)};
}
} // namespace JoinInterpreterHelper
} // namespace DB