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#include <Processors/Transforms/ExpressionTransform.h>
#include <Interpreters/ExpressionActions.h>
namespace DB
{
Block ExpressionTransform::transformHeader(Block header, const ActionsDAG & expression)
{
return expression.updateHeader(std::move(header));
}
ExpressionTransform::ExpressionTransform(const Block & header_, ExpressionActionsPtr expression_)
: ISimpleTransform(header_, transformHeader(header_, expression_->getActionsDAG()), false)
, expression(std::move(expression_))
{
}
void ExpressionTransform::transform(Chunk & chunk)
{
size_t num_rows = chunk.getNumRows();
auto block = getInputPort().getHeader().cloneWithColumns(chunk.detachColumns());
expression->execute(block, num_rows);
chunk.setColumns(block.getColumns(), num_rows);
}
ConvertingTransform::ConvertingTransform(const Block & header_, ExpressionActionsPtr expression_)
: ExceptionKeepingTransform(header_, ExpressionTransform::transformHeader(header_, expression_->getActionsDAG()))
, expression(std::move(expression_))
{
}
void ConvertingTransform::onConsume(Chunk chunk)
{
size_t num_rows = chunk.getNumRows();
auto block = getInputPort().getHeader().cloneWithColumns(chunk.detachColumns());
expression->execute(block, num_rows);
chunk.setColumns(block.getColumns(), num_rows);
cur_chunk = std::move(chunk);
}
}
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