ClickHouse/src/Interpreters/ArrayJoinAction.cpp

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#include <Common/typeid_cast.h>
#include <Columns/ColumnArray.h>
#include <DataTypes/DataTypeArray.h>
#include <DataTypes/DataTypesNumber.h>
#include <Functions/FunctionFactory.h>
#include <Interpreters/Context.h>
#include <Interpreters/ArrayJoinAction.h>
namespace DB
{
namespace ErrorCodes
{
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extern const int LOGICAL_ERROR;
extern const int SIZES_OF_ARRAYS_DOESNT_MATCH;
extern const int TYPE_MISMATCH;
}
ArrayJoinAction::ArrayJoinAction(const NameSet & array_joined_columns_, bool array_join_is_left, ContextPtr context)
: columns(array_joined_columns_)
, is_left(array_join_is_left)
, is_unaligned(context->getSettingsRef().enable_unaligned_array_join)
{
if (columns.empty())
throw Exception("No arrays to join", ErrorCodes::LOGICAL_ERROR);
if (is_unaligned)
{
function_length = FunctionFactory::instance().get("length", context);
function_greatest = FunctionFactory::instance().get("greatest", context);
function_arrayResize = FunctionFactory::instance().get("arrayResize", context);
}
else if (is_left)
function_builder = FunctionFactory::instance().get("emptyArrayToSingle", context);
}
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void ArrayJoinAction::prepare(ColumnsWithTypeAndName & sample) const
{
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for (auto & current : sample)
{
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if (columns.count(current.name) == 0)
continue;
const DataTypeArray * array_type = typeid_cast<const DataTypeArray *>(&*current.type);
if (!array_type)
throw Exception("ARRAY JOIN requires array argument", ErrorCodes::TYPE_MISMATCH);
current.type = array_type->getNestedType();
current.column = nullptr;
}
}
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void ArrayJoinAction::execute(Block & block)
{
if (columns.empty())
throw Exception("No arrays to join", ErrorCodes::LOGICAL_ERROR);
ColumnPtr any_array_ptr = block.getByName(*columns.begin()).column->convertToFullColumnIfConst();
const ColumnArray * any_array = typeid_cast<const ColumnArray *>(&*any_array_ptr);
if (!any_array)
throw Exception("ARRAY JOIN of not array: " + *columns.begin(), ErrorCodes::TYPE_MISMATCH);
/// If LEFT ARRAY JOIN, then we create columns in which empty arrays are replaced by arrays with one element - the default value.
std::map<String, ColumnPtr> non_empty_array_columns;
if (is_unaligned)
{
/// Resize all array joined columns to the longest one, (at least 1 if LEFT ARRAY JOIN), padded with default values.
auto rows = block.rows();
auto uint64 = std::make_shared<DataTypeUInt64>();
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ColumnWithTypeAndName column_of_max_length{{}, uint64, {}};
if (is_left)
column_of_max_length = ColumnWithTypeAndName(uint64->createColumnConst(rows, 1u), uint64, {});
else
column_of_max_length = ColumnWithTypeAndName(uint64->createColumnConst(rows, 0u), uint64, {});
for (const auto & name : columns)
{
auto & src_col = block.getByName(name);
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ColumnsWithTypeAndName tmp_block{src_col}; //, {{}, uint64, {}}};
auto len_col = function_length->build(tmp_block)->execute(tmp_block, uint64, rows);
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ColumnsWithTypeAndName tmp_block2{column_of_max_length, {len_col, uint64, {}}};
column_of_max_length.column = function_greatest->build(tmp_block2)->execute(tmp_block2, uint64, rows);
}
for (const auto & name : columns)
{
auto & src_col = block.getByName(name);
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ColumnsWithTypeAndName tmp_block{src_col, column_of_max_length};
src_col.column = function_arrayResize->build(tmp_block)->execute(tmp_block, src_col.type, rows);
any_array_ptr = src_col.column->convertToFullColumnIfConst();
}
any_array = typeid_cast<const ColumnArray *>(&*any_array_ptr);
}
else if (is_left)
{
for (const auto & name : columns)
{
auto src_col = block.getByName(name);
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ColumnsWithTypeAndName tmp_block{src_col};
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non_empty_array_columns[name] = function_builder->build(tmp_block)->execute(tmp_block, src_col.type, src_col.column->size());
}
any_array_ptr = non_empty_array_columns.begin()->second->convertToFullColumnIfConst();
any_array = &typeid_cast<const ColumnArray &>(*any_array_ptr);
}
size_t num_columns = block.columns();
for (size_t i = 0; i < num_columns; ++i)
{
ColumnWithTypeAndName & current = block.safeGetByPosition(i);
if (columns.count(current.name))
{
if (!typeid_cast<const DataTypeArray *>(&*current.type))
throw Exception("ARRAY JOIN of not array: " + current.name, ErrorCodes::TYPE_MISMATCH);
ColumnPtr array_ptr = (is_left && !is_unaligned) ? non_empty_array_columns[current.name] : current.column;
array_ptr = array_ptr->convertToFullColumnIfConst();
const ColumnArray & array = typeid_cast<const ColumnArray &>(*array_ptr);
if (!is_unaligned && !array.hasEqualOffsets(typeid_cast<const ColumnArray &>(*any_array_ptr)))
throw Exception("Sizes of ARRAY-JOIN-ed arrays do not match", ErrorCodes::SIZES_OF_ARRAYS_DOESNT_MATCH);
current.column = typeid_cast<const ColumnArray &>(*array_ptr).getDataPtr();
current.type = typeid_cast<const DataTypeArray &>(*current.type).getNestedType();
}
else
{
current.column = current.column->replicate(any_array->getOffsets());
}
}
}
}