mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-17 21:24:28 +00:00
270 lines
8.5 KiB
C++
270 lines
8.5 KiB
C++
#include <DB/DataTypes/FieldToDataType.h>
|
|
|
|
#include <DB/Parsers/ASTFunction.h>
|
|
#include <DB/Parsers/ASTIdentifier.h>
|
|
#include <DB/Parsers/ASTLiteral.h>
|
|
#include <DB/Parsers/ASTAsterisk.h>
|
|
#include <DB/Parsers/ASTExpressionList.h>
|
|
|
|
#include <DB/Interpreters/Expression.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
void Expression::addSemantic(ASTPtr & ast)
|
|
{
|
|
if (dynamic_cast<ASTAsterisk *>(&*ast))
|
|
{
|
|
ASTExpressionList * all_columns = new ASTExpressionList(ast->range);
|
|
for (NamesAndTypes::const_iterator it = context.columns.begin(); it != context.columns.end(); ++it)
|
|
all_columns->children.push_back(new ASTIdentifier(ast->range, it->first));
|
|
ast = all_columns;
|
|
}
|
|
else if (ASTFunction * node = dynamic_cast<ASTFunction *>(&*ast))
|
|
{
|
|
Functions::const_iterator it = context.functions->find(node->name);
|
|
if (it == context.functions->end())
|
|
throw Exception("Unknown function " + node->name, ErrorCodes::UNKNOWN_FUNCTION);
|
|
|
|
node->function = it->second;
|
|
}
|
|
else if (ASTIdentifier * node = dynamic_cast<ASTIdentifier *>(&*ast))
|
|
{
|
|
if (node->kind == ASTIdentifier::Column)
|
|
{
|
|
NamesAndTypes::const_iterator it = context.columns.find(node->name);
|
|
if (it == context.columns.end())
|
|
throw Exception("Unknown identifier " + node->name, ErrorCodes::UNKNOWN_IDENTIFIER);
|
|
|
|
node->type = it->second;
|
|
required_columns.insert(node->name);
|
|
}
|
|
}
|
|
else if (ASTLiteral * node = dynamic_cast<ASTLiteral *>(&*ast))
|
|
{
|
|
node->type = boost::apply_visitor(FieldToDataType(), node->value);
|
|
}
|
|
|
|
for (ASTs::iterator it = ast->children.begin(); it != ast->children.end(); ++it)
|
|
addSemantic(*it);
|
|
}
|
|
|
|
|
|
void Expression::checkTypes(ASTPtr ast)
|
|
{
|
|
/// Обход в глубину
|
|
|
|
for (ASTs::iterator it = ast->children.begin(); it != ast->children.end(); ++it)
|
|
checkTypes(*it);
|
|
|
|
if (ASTFunction * node = dynamic_cast<ASTFunction *>(&*ast))
|
|
{
|
|
/// Типы аргументов
|
|
DataTypes argument_types;
|
|
ASTs & arguments = dynamic_cast<ASTExpressionList &>(*node->arguments).children;
|
|
|
|
for (ASTs::iterator it = arguments.begin(); it != arguments.end(); ++it)
|
|
{
|
|
if (ASTFunction * arg = dynamic_cast<ASTFunction *>(&**it))
|
|
argument_types.insert(argument_types.end(), arg->return_types.begin(), arg->return_types.end());
|
|
else if (ASTIdentifier * arg = dynamic_cast<ASTIdentifier *>(&**it))
|
|
argument_types.push_back(arg->type);
|
|
else if (ASTLiteral * arg = dynamic_cast<ASTLiteral *>(&**it))
|
|
argument_types.push_back(arg->type);
|
|
}
|
|
|
|
/// Получаем типы результата
|
|
node->return_types = node->function->getReturnTypes(argument_types);
|
|
}
|
|
}
|
|
|
|
|
|
void Expression::glueTree(ASTPtr ast)
|
|
{
|
|
Subtrees subtrees;
|
|
glueTreeImpl(ast, subtrees);
|
|
}
|
|
|
|
|
|
void Expression::glueTreeImpl(ASTPtr ast, Subtrees & subtrees)
|
|
{
|
|
/// Обход в глубину
|
|
|
|
for (ASTs::iterator it = ast->children.begin(); it != ast->children.end(); ++it)
|
|
glueTreeImpl(*it, subtrees);
|
|
|
|
if (ASTFunction * node = dynamic_cast<ASTFunction *>(&*ast))
|
|
{
|
|
String tree_id = node->arguments->getTreeID();
|
|
if (subtrees.end() == subtrees.find(tree_id))
|
|
subtrees[tree_id] = node->arguments;
|
|
else
|
|
node->arguments = subtrees[tree_id];
|
|
}
|
|
else if (ASTExpressionList * node = dynamic_cast<ASTExpressionList *>(&*ast))
|
|
{
|
|
for (ASTs::iterator it = node->children.begin(); it != node->children.end(); ++it)
|
|
{
|
|
String tree_id = (*it)->getTreeID();
|
|
if (subtrees.end() == subtrees.find(tree_id))
|
|
subtrees[tree_id] = *it;
|
|
else
|
|
*it = subtrees[tree_id];
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
Names Expression::getRequiredColumns()
|
|
{
|
|
Names res;
|
|
res.reserve(required_columns.size());
|
|
for (NamesSet::const_iterator it = required_columns.begin(); it != required_columns.end(); ++it)
|
|
res.push_back(*it);
|
|
return res;
|
|
}
|
|
|
|
|
|
void Expression::setNotCalculated(ASTPtr ast, unsigned part_id)
|
|
{
|
|
if ((ast->part_id & part_id) || (ast->part_id == 0 && part_id == 0))
|
|
ast->calculated = false;
|
|
for (ASTs::iterator it = ast->children.begin(); it != ast->children.end(); ++it)
|
|
setNotCalculated(*it, part_id);
|
|
}
|
|
|
|
|
|
void Expression::execute(Block & block, unsigned part_id)
|
|
{
|
|
setNotCalculated(ast, part_id);
|
|
executeImpl(ast, block, part_id);
|
|
}
|
|
|
|
|
|
void Expression::executeImpl(ASTPtr ast, Block & block, unsigned part_id)
|
|
{
|
|
/// Обход в глубину
|
|
|
|
for (ASTs::iterator it = ast->children.begin(); it != ast->children.end(); ++it)
|
|
executeImpl(*it, block, part_id);
|
|
|
|
if (ast->calculated || !((ast->part_id & part_id) || (ast->part_id == 0 && part_id == 0)))
|
|
return;
|
|
|
|
/** Столбцы из таблицы уже загружены в блок.
|
|
* Вычисление состоит в добавлении в блок новых столбцов - констант и результатов вычислений функций.
|
|
*/
|
|
if (ASTFunction * node = dynamic_cast<ASTFunction *>(&*ast))
|
|
{
|
|
/// Вставляем в блок столбцы - результаты вычисления функции
|
|
ColumnNumbers argument_numbers;
|
|
ColumnNumbers & result_numbers = node->return_column_numbers;
|
|
result_numbers.clear();
|
|
|
|
size_t res_num = 0;
|
|
for (DataTypes::const_iterator it = node->return_types.begin(); it != node->return_types.end(); ++it)
|
|
{
|
|
ColumnWithNameAndType column;
|
|
column.type = *it;
|
|
column.name = node->getTreeID() + "_" + Poco::NumberFormatter::format(res_num);
|
|
|
|
result_numbers.push_back(block.columns());
|
|
block.insert(column);
|
|
++res_num;
|
|
}
|
|
|
|
ASTs arguments = node->arguments->children;
|
|
for (ASTs::iterator it = arguments.begin(); it != arguments.end(); ++it)
|
|
{
|
|
if (ASTIdentifier * ident = dynamic_cast<ASTIdentifier *>(&**it))
|
|
argument_numbers.push_back(block.getPositionByName(ident->name));
|
|
else if (ASTFunction * func = dynamic_cast<ASTFunction *>(&**it))
|
|
argument_numbers.insert(argument_numbers.end(), func->return_column_numbers.begin(), func->return_column_numbers.end());
|
|
else
|
|
argument_numbers.push_back(block.getPositionByName((*it)->getTreeID()));
|
|
}
|
|
|
|
node->function->execute(block, argument_numbers, result_numbers);
|
|
}
|
|
else if (ASTLiteral * node = dynamic_cast<ASTLiteral *>(&*ast))
|
|
{
|
|
ColumnWithNameAndType column;
|
|
column.column = node->type->createConstColumn(block.rows(), node->value);
|
|
column.type = node->type;
|
|
column.name = node->getTreeID();
|
|
|
|
block.insert(column);
|
|
}
|
|
|
|
ast->calculated = true;
|
|
}
|
|
|
|
|
|
Block Expression::projectResult(Block & block, bool without_duplicates, unsigned part_id)
|
|
{
|
|
Block res;
|
|
collectFinalColumns(ast, block, res, without_duplicates, part_id);
|
|
return res;
|
|
}
|
|
|
|
|
|
void Expression::collectFinalColumns(ASTPtr ast, Block & src, Block & dst, bool without_duplicates, unsigned part_id)
|
|
{
|
|
/// Обход в глубину, который не заходит внутрь функций.
|
|
if (!((ast->part_id & part_id) || (ast->part_id == 0 && part_id == 0)))
|
|
{
|
|
if (!dynamic_cast<ASTFunction *>(&*ast))
|
|
for (ASTs::iterator it = ast->children.begin(); it != ast->children.end(); ++it)
|
|
collectFinalColumns(*it, src, dst, without_duplicates, part_id);
|
|
return;
|
|
}
|
|
|
|
if (ASTIdentifier * ident = dynamic_cast<ASTIdentifier *>(&*ast))
|
|
{
|
|
if (ident->kind == ASTIdentifier::Column)
|
|
without_duplicates ? dst.insertUnique(src.getByName(ident->name)) : dst.insert(src.getByName(ident->name));
|
|
}
|
|
else if (dynamic_cast<ASTLiteral *>(&*ast))
|
|
without_duplicates ? dst.insertUnique(src.getByName(ast->getTreeID())) : dst.insert(src.getByName(ast->getTreeID()));
|
|
else if (ASTFunction * func = dynamic_cast<ASTFunction *>(&*ast))
|
|
{
|
|
for (size_t i = 0, size = func->return_types.size(); i != size; ++i)
|
|
without_duplicates
|
|
? dst.insertUnique(src.getByName(ast->getTreeID() + "_" + Poco::NumberFormatter::format(i)))
|
|
: dst.insert(src.getByName(ast->getTreeID() + "_" + Poco::NumberFormatter::format(i)));
|
|
}
|
|
else
|
|
for (ASTs::iterator it = ast->children.begin(); it != ast->children.end(); ++it)
|
|
collectFinalColumns(*it, src, dst, without_duplicates, part_id);
|
|
}
|
|
|
|
|
|
DataTypes Expression::getReturnTypes()
|
|
{
|
|
DataTypes res;
|
|
getReturnTypesImpl(ast, res);
|
|
return res;
|
|
}
|
|
|
|
|
|
void Expression::getReturnTypesImpl(ASTPtr ast, DataTypes & res)
|
|
{
|
|
/// Обход в глубину, который не заходит внутрь функций.
|
|
if (ASTIdentifier * ident = dynamic_cast<ASTIdentifier *>(&*ast))
|
|
{
|
|
if (ident->kind == ASTIdentifier::Column)
|
|
res.push_back(ident->type);
|
|
}
|
|
else if (ASTLiteral * lit = dynamic_cast<ASTLiteral *>(&*ast))
|
|
res.push_back(lit->type);
|
|
else if (ASTFunction * func = dynamic_cast<ASTFunction *>(&*ast))
|
|
res.insert(res.end(), func->return_types.begin(), func->return_types.end());
|
|
else
|
|
for (ASTs::iterator it = ast->children.begin(); it != ast->children.end(); ++it)
|
|
getReturnTypesImpl(*it, res);
|
|
}
|
|
|
|
|
|
}
|