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Better implementation

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This commit is contained in:
Nikolay Degterinsky 2022-11-30 02:14:04 +00:00
parent 72acedfba6
commit 1a090e9901
15 changed files with 184 additions and 136 deletions
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41
src/Analyzer/MatcherNode.cpp
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@ -11,6 +11,7 @@
#include <Parsers/ASTQualifiedAsterisk.h>
#include <Parsers/ASTColumnsMatcher.h>
#include <Parsers/ASTExpressionList.h>
#include <Parsers/ASTColumnsTransformers.h>
namespace DB
{
@ -206,11 +207,15 @@ QueryTreeNodePtr MatcherNode::cloneImpl() const
ASTPtr MatcherNode::toASTImpl() const
{
ASTPtr result;
ASTPtr transformers;
auto transformers = std::make_shared<ASTExpressionList>();
if (!children.empty())
{
transformers = std::make_shared<ASTColumnsTransformerList>();
for (const auto & child : children)
transformers->children.push_back(child->toAST());
}
if (matcher_type == MatcherNodeType::ASTERISK)
{
@ -218,8 +223,11 @@ ASTPtr MatcherNode::toASTImpl() const
{
auto asterisk = std::make_shared<ASTAsterisk>();
if (transformers)
{
asterisk->transformers = std::move(transformers);
asterisk->children.push_back(asterisk->transformers);
}
result = asterisk;
}
@ -229,10 +237,13 @@ ASTPtr MatcherNode::toASTImpl() const
auto identifier_parts = qualified_identifier.getParts();
qualified_asterisk->qualifier = std::make_shared<ASTIdentifier>(std::move(identifier_parts));
qualified_asterisk->transformers = std::move(transformers);
qualified_asterisk->children.push_back(qualified_asterisk->qualifier);
if (transformers)
{
qualified_asterisk->transformers = std::move(transformers);
qualified_asterisk->children.push_back(qualified_asterisk->transformers);
}
result = qualified_asterisk;
}
@ -244,8 +255,11 @@ ASTPtr MatcherNode::toASTImpl() const
auto regexp_matcher = std::make_shared<ASTColumnsRegexpMatcher>();
regexp_matcher->setPattern(columns_matcher->pattern());
if (transformers)
{
regexp_matcher->transformers = std::move(transformers);
regexp_matcher->children.push_back(regexp_matcher->transformers);
}
result = regexp_matcher;
}
@ -256,10 +270,13 @@ ASTPtr MatcherNode::toASTImpl() const
auto identifier_parts = qualified_identifier.getParts();
regexp_matcher->qualifier = std::make_shared<ASTIdentifier>(std::move(identifier_parts));
regexp_matcher->transformers = std::move(transformers);
regexp_matcher->children.push_back(regexp_matcher->qualifier);
if (transformers)
{
regexp_matcher->transformers = std::move(transformers);
regexp_matcher->children.push_back(regexp_matcher->transformers);
}
result = regexp_matcher;
}
@ -279,10 +296,13 @@ ASTPtr MatcherNode::toASTImpl() const
{
auto columns_list_matcher = std::make_shared<ASTColumnsListMatcher>();
columns_list_matcher->column_list = std::move(column_list);
columns_list_matcher->transformers = std::move(transformers);
columns_list_matcher->children.push_back(columns_list_matcher->column_list);
if (transformers)
{
columns_list_matcher->transformers = std::move(transformers);
columns_list_matcher->children.push_back(columns_list_matcher->transformers);
}
result = columns_list_matcher;
}
@ -293,11 +313,14 @@ ASTPtr MatcherNode::toASTImpl() const
auto identifier_parts = qualified_identifier.getParts();
columns_list_matcher->qualifier = std::make_shared<ASTIdentifier>(std::move(identifier_parts));
columns_list_matcher->column_list = std::move(column_list);
columns_list_matcher->transformers = std::move(transformers);
columns_list_matcher->children.push_back(columns_list_matcher->qualifier);
columns_list_matcher->children.push_back(columns_list_matcher->column_list);
if (transformers)
{
columns_list_matcher->transformers = std::move(transformers);
columns_list_matcher->children.push_back(columns_list_matcher->transformers);
}
result = columns_list_matcher;
}

3
src/Analyzer/QueryTreeBuilder.cpp
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@ -809,6 +809,9 @@ ColumnTransformersNodes QueryTreeBuilder::buildColumnTransformers(const ASTPtr &
{
ColumnTransformersNodes column_transformers;
if (!matcher_expression)
return column_transformers;
for (const auto & child : matcher_expression->children)
{
if (auto * apply_transformer = child->as<ASTColumnsApplyTransformer>())

21
src/Interpreters/JoinToSubqueryTransformVisitor.cpp
View File

@ -50,9 +50,7 @@ ASTPtr makeSubqueryQualifiedAsterisk()
{
auto asterisk = std::make_shared<ASTQualifiedAsterisk>();
asterisk->qualifier = std::make_shared<ASTIdentifier>("--.s");
asterisk->transformers = std::make_shared<ASTExpressionList>();
asterisk->children.push_back(asterisk->qualifier);
asterisk->children.push_back(asterisk->transformers);
return asterisk;
}
@ -142,9 +140,12 @@ private:
for (auto & table_name : data.tables_order)
data.addTableColumns(table_name, columns);
if (asterisk->transformers)
{
for (const auto & transformer : asterisk->transformers->children)
IASTColumnsTransformer::transform(transformer, columns);
}
}
else if (const auto * qualified_asterisk = child->as<ASTQualifiedAsterisk>())
{
has_asterisks = true;
@ -155,9 +156,12 @@ private:
data.addTableColumns(identifier.name(), columns);
if (qualified_asterisk->transformers)
{
for (const auto & transformer : qualified_asterisk->transformers->children)
IASTColumnsTransformer::transform(transformer, columns);
}
}
else if (const auto * columns_list_matcher = child->as<ASTColumnsListMatcher>())
{
has_asterisks = true;
@ -165,9 +169,12 @@ private:
for (const auto & ident : columns_list_matcher->column_list->children)
columns.emplace_back(ident->clone());
if (columns_list_matcher->transformers)
{
for (const auto & transformer : columns_list_matcher->transformers->children)
IASTColumnsTransformer::transform(transformer, columns);
}
}
else if (const auto * columns_regexp_matcher = child->as<ASTColumnsRegexpMatcher>())
{
has_asterisks = true;
@ -178,9 +185,12 @@ private:
columns,
[&](const String & column_name) { return columns_regexp_matcher->isColumnMatching(column_name); });
if (columns_regexp_matcher->transformers)
{
for (const auto & transformer : columns_regexp_matcher->transformers->children)
IASTColumnsTransformer::transform(transformer, columns);
}
}
else
data.new_select_expression_list->children.push_back(child);
@ -409,12 +419,7 @@ private:
if (!data.done)
{
if (data.expression_list->children.empty())
{
auto asterisk = std::make_shared<ASTAsterisk>();
asterisk->transformers = std::make_shared<ASTExpressionList>();
asterisk->children.push_back(asterisk->transformers);
data.expression_list->children.push_back(std::move(asterisk));
}
data.expression_list->children.emplace_back(std::make_shared<ASTAsterisk>());
select.setExpression(ASTSelectQuery::Expression::SELECT, std::move(data.expression_list));
}

7
src/Interpreters/JoinedTables.cpp
View File

@ -96,12 +96,7 @@ void replaceJoinedTable(const ASTSelectQuery & select_query)
auto new_select = addASTChildren<ASTSelectQuery>(*list_of_selects);
new_select->setExpression(ASTSelectQuery::Expression::SELECT, std::make_shared<ASTExpressionList>());
auto asterisk = std::make_shared<ASTAsterisk>();
asterisk->transformers = std::make_shared<ASTExpressionList>();
asterisk->children.push_back(asterisk->transformers);
new_select->select()->children.push_back(std::move(asterisk));
addASTChildren<ASTAsterisk>(*new_select->select());
new_select->setExpression(ASTSelectQuery::Expression::TABLES, std::make_shared<ASTTablesInSelectQuery>());
auto tables_elem = addASTChildren<ASTTablesInSelectQueryElement>(*new_select->tables());

12
src/Interpreters/TranslateQualifiedNamesVisitor.cpp
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@ -253,17 +253,23 @@ void TranslateQualifiedNamesMatcher::visit(ASTExpressionList & node, const ASTPt
first_table = false;
}
if (asterisk->transformers)
{
for (const auto & transformer : asterisk->transformers->children)
IASTColumnsTransformer::transform(transformer, columns);
}
}
else if (auto * asterisk_column_list = child->as<ASTColumnsListMatcher>())
{
for (const auto & ident : asterisk_column_list->column_list->children)
columns.emplace_back(ident->clone());
if (asterisk_column_list->transformers)
{
for (const auto & transformer : asterisk_column_list->transformers->children)
IASTColumnsTransformer::transform(transformer, columns);
}
}
else if (const auto * asterisk_regexp_pattern = child->as<ASTColumnsRegexpMatcher>())
{
bool first_table = true;
@ -279,9 +285,12 @@ void TranslateQualifiedNamesMatcher::visit(ASTExpressionList & node, const ASTPt
first_table = false;
}
if (asterisk_regexp_pattern->transformers)
{
for (const auto & transformer : asterisk_regexp_pattern->transformers->children)
IASTColumnsTransformer::transform(transformer, columns);
}
}
else if (const auto * qualified_asterisk = child->as<ASTQualifiedAsterisk>())
{
DatabaseAndTableWithAlias ident_db_and_name(qualified_asterisk->qualifier);
@ -296,9 +305,12 @@ void TranslateQualifiedNamesMatcher::visit(ASTExpressionList & node, const ASTPt
}
}
if (qualified_asterisk->transformers)
{
for (const auto & transformer : qualified_asterisk->transformers->children)
IASTColumnsTransformer::transform(transformer, columns);
}
}
else
columns.emplace_back(child);

21
src/Parsers/ASTAsterisk.cpp
View File

@ -10,14 +10,21 @@ ASTPtr ASTAsterisk::clone() const
auto clone = std::make_shared<ASTAsterisk>(*this);
if (expression) { clone->expression = expression->clone(); clone->children.push_back(clone->expression); }
clone->transformers = transformers->clone();
clone->children.push_back(clone->transformers);
if (transformers) { clone->transformers = transformers->clone(); clone->children.push_back(clone->transformers); }
return clone;
}
void ASTAsterisk::appendColumnName(WriteBuffer & ostr) const { ostr.write('*'); }
void ASTAsterisk::appendColumnName(WriteBuffer & ostr) const
{
if (expression)
{
expression->appendColumnName(ostr);
writeCString(".", ostr);
}
ostr.write('*');
}
void ASTAsterisk::formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const
{
@ -29,11 +36,9 @@ void ASTAsterisk::formatImpl(const FormatSettings & settings, FormatState & stat
settings.ostr << "*";
/// Format column transformers
for (const auto & child : transformers->children)
if (transformers)
{
settings.ostr << ' ';
child->formatImpl(settings, state, frame);
transformers->formatImpl(settings, state, frame);
}
}

53
src/Parsers/ASTColumnsMatcher.cpp
View File

@ -20,9 +20,7 @@ ASTPtr ASTColumnsRegexpMatcher::clone() const
auto clone = std::make_shared<ASTColumnsRegexpMatcher>(*this);
if (expression) { clone->expression = expression->clone(); clone->children.push_back(clone->expression); }
clone->transformers = transformers->clone();
clone->children.push_back(clone->transformers);
if (transformers) { clone->transformers = transformers->clone(); clone->children.push_back(clone->transformers); }
return clone;
}
@ -60,11 +58,9 @@ void ASTColumnsRegexpMatcher::formatImpl(const FormatSettings & settings, Format
settings.ostr << quoteString(original_pattern);
settings.ostr << ")";
/// Format column transformers
for (const auto & child : transformers->children)
if (transformers)
{
settings.ostr << ' ';
child->formatImpl(settings, state, frame);
transformers->formatImpl(settings, state, frame);
}
}
@ -98,22 +94,14 @@ ASTPtr ASTColumnsListMatcher::clone() const
auto clone = std::make_shared<ASTColumnsListMatcher>(*this);
if (expression) { clone->expression = expression->clone(); clone->children.push_back(clone->expression); }
if (transformers) { clone->transformers = transformers->clone(); clone->children.push_back(clone->transformers); }
clone->column_list = column_list->clone();
clone->transformers = transformers->clone();
clone->children.push_back(clone->column_list);
clone->children.push_back(clone->transformers);
return clone;
}
void ASTColumnsListMatcher::updateTreeHashImpl(SipHash & hash_state) const
{
column_list->updateTreeHash(hash_state);
IAST::updateTreeHashImpl(hash_state);
}
void ASTColumnsListMatcher::appendColumnName(WriteBuffer & ostr) const
{
if (expression)
@ -154,11 +142,9 @@ void ASTColumnsListMatcher::formatImpl(const FormatSettings & settings, FormatSt
}
settings.ostr << ")";
/// Format column transformers
for (const auto & child : transformers->children)
if (transformers)
{
settings.ostr << ' ';
child->formatImpl(settings, state, frame);
transformers->formatImpl(settings, state, frame);
}
}
@ -166,11 +152,10 @@ ASTPtr ASTQualifiedColumnsRegexpMatcher::clone() const
{
auto clone = std::make_shared<ASTQualifiedColumnsRegexpMatcher>(*this);
clone->qualifier = qualifier->clone();
clone->transformers = transformers->clone();
if (transformers) { clone->transformers = transformers->clone(); clone->children.push_back(clone->transformers); }
clone->qualifier = qualifier->clone();
clone->children.push_back(clone->qualifier);
clone->children.push_back(clone->transformers);
return clone;
}
@ -224,11 +209,9 @@ void ASTQualifiedColumnsRegexpMatcher::formatImpl(const FormatSettings & setting
settings.ostr << quoteString(original_pattern);
settings.ostr << ")";
/// Format column transformers
for (const auto & child : transformers->children)
if (transformers)
{
settings.ostr << ' ';
child->formatImpl(settings, state, frame);
transformers->formatImpl(settings, state, frame);
}
}
@ -236,13 +219,13 @@ ASTPtr ASTQualifiedColumnsListMatcher::clone() const
{
auto clone = std::make_shared<ASTQualifiedColumnsListMatcher>(*this);
if (transformers) { clone->transformers = transformers->clone(); clone->children.push_back(clone->transformers); }
clone->qualifier = qualifier->clone();
clone->column_list = column_list->clone();
clone->transformers = transformers->clone();
clone->children.push_back(clone->qualifier);
clone->children.push_back(clone->column_list);
clone->children.push_back(clone->transformers);
return clone;
}
@ -262,12 +245,6 @@ void ASTQualifiedColumnsListMatcher::appendColumnName(WriteBuffer & ostr) const
writeChar(')', ostr);
}
void ASTQualifiedColumnsListMatcher::updateTreeHashImpl(SipHash & hash_state) const
{
column_list->updateTreeHash(hash_state);
IAST::updateTreeHashImpl(hash_state);
}
void ASTQualifiedColumnsListMatcher::formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const
{
settings.ostr << (settings.hilite ? hilite_keyword : "");
@ -283,11 +260,9 @@ void ASTQualifiedColumnsListMatcher::formatImpl(const FormatSettings & settings,
}
settings.ostr << ")";
/// Format column transformers
for (const auto & child : transformers->children)
if (transformers)
{
settings.ostr << ' ';
child->formatImpl(settings, state, frame);
transformers->formatImpl(settings, state, frame);
}
}

2
src/Parsers/ASTColumnsMatcher.h
View File

@ -46,7 +46,6 @@ public:
String getID(char) const override { return "ColumnsListMatcher"; }
ASTPtr clone() const override;
void appendColumnName(WriteBuffer & ostr) const override;
void updateTreeHashImpl(SipHash & hash_state) const override;
ASTPtr expression;
ASTPtr column_list;
@ -85,7 +84,6 @@ public:
String getID(char) const override { return "QualifiedColumnsListMatcher"; }
ASTPtr clone() const override;
void appendColumnName(WriteBuffer & ostr) const override;
void updateTreeHashImpl(SipHash & hash_state) const override;
ASTPtr qualifier;
ASTPtr column_list;

9
src/Parsers/ASTColumnsTransformers.cpp
View File

@ -19,6 +19,15 @@ namespace ErrorCodes
extern const int CANNOT_COMPILE_REGEXP;
}
void ASTColumnsTransformerList::formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const
{
for (const auto & child : children)
{
settings.ostr << ' ';
child->formatImpl(settings, state, frame);
}
}
void IASTColumnsTransformer::transform(const ASTPtr & transformer, ASTs & nodes)
{
if (const auto * apply = transformer->as<ASTColumnsApplyTransformer>())

17
src/Parsers/ASTColumnsTransformers.h
View File

@ -9,6 +9,23 @@ namespace re2
namespace DB
{
/// A list of column transformers
class ASTColumnsTransformerList : public IAST
{
public:
String getID(char) const override { return "ColumnsTransformerList"; }
ASTPtr clone() const override
{
auto clone = std::make_shared<ASTColumnsTransformerList>(*this);
clone->cloneChildren();
return clone;
}
protected:
void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override;
};
class IASTColumnsTransformer : public IAST
{
public:

6
src/Parsers/ASTQualifiedAsterisk.cpp
View File

@ -16,11 +16,9 @@ void ASTQualifiedAsterisk::formatImpl(const FormatSettings & settings, FormatSta
qualifier->formatImpl(settings, state, frame);
settings.ostr << ".*";
/// Format column transformers
for (const auto & child : transformers->children)
if (transformers)
{
settings.ostr << ' ';
child->formatImpl(settings, state, frame);
transformers->formatImpl(settings, state, frame);
}
}

5
src/Parsers/ASTQualifiedAsterisk.h
View File

@ -18,11 +18,10 @@ public:
{
auto clone = std::make_shared<ASTQualifiedAsterisk>(*this);
clone->qualifier = qualifier->clone();
clone->transformers = transformers->clone();
if (transformers) { clone->transformers = transformers->clone(); clone->children.push_back(clone->transformers); }
clone->qualifier = qualifier->clone();
clone->children.push_back(clone->qualifier);
clone->children.push_back(clone->transformers);
return clone;
}

44
src/Parsers/ExpressionElementParsers.cpp
View File

@ -80,12 +80,7 @@ static ASTPtr buildSelectFromTableFunction(const std::shared_ptr<ASTFunction> &
{
auto select_ast = std::make_shared<ASTSelectQuery>();
select_ast->setExpression(ASTSelectQuery::Expression::SELECT, std::make_shared<ASTExpressionList>());
auto asterisk = std::make_shared<ASTAsterisk>();
asterisk->transformers = std::make_shared<ASTExpressionList>();
asterisk->children.push_back(asterisk->transformers);
select_ast->select()->children.push_back(std::move(asterisk));
select_ast->select()->children.push_back(std::make_shared<ASTAsterisk>());
auto list_of_selects = std::make_shared<ASTExpressionList>();
list_of_selects->children.push_back(select_ast);
@ -1553,7 +1548,7 @@ bool ParserAsterisk::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
{
++pos;
auto asterisk = std::make_shared<ASTAsterisk>();
auto transformers = std::make_shared<ASTExpressionList>();
auto transformers = std::make_shared<ASTColumnsTransformerList>();
ParserColumnsTransformers transformers_p(allowed_transformers);
ASTPtr transformer;
while (transformers_p.parse(pos, transformer, expected))
@ -1561,8 +1556,11 @@ bool ParserAsterisk::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
transformers->children.push_back(transformer);
}
if (!transformers->children.empty())
{
asterisk->transformers = std::move(transformers);
asterisk->children.push_back(asterisk->transformers);
}
node = std::move(asterisk);
return true;
@ -1585,7 +1583,7 @@ bool ParserQualifiedAsterisk::parseImpl(Pos & pos, ASTPtr & node, Expected & exp
++pos;
auto res = std::make_shared<ASTQualifiedAsterisk>();
auto transformers = std::make_shared<ASTExpressionList>();
auto transformers = std::make_shared<ASTColumnsTransformerList>();
ParserColumnsTransformers transformers_p;
ASTPtr transformer;
while (transformers_p.parse(pos, transformer, expected))
@ -1594,9 +1592,13 @@ bool ParserQualifiedAsterisk::parseImpl(Pos & pos, ASTPtr & node, Expected & exp
}
res->qualifier = std::move(node);
res->transformers = std::move(transformers);
res->children.push_back(res->qualifier);
if (!transformers->children.empty())
{
res->transformers = std::move(transformers);
res->children.push_back(res->transformers);
}
node = std::move(res);
return true;
@ -1621,7 +1623,7 @@ static bool parseColumnsMatcherBody(IParser::Pos & pos, ASTPtr & node, Expected
return false;
++pos;
auto transformers = std::make_shared<ASTExpressionList>();
auto transformers = std::make_shared<ASTColumnsTransformerList>();
ParserColumnsTransformers transformers_p(allowed_transformers);
ASTPtr transformer;
while (transformers_p.parse(pos, transformer, expected))
@ -1635,9 +1637,13 @@ static bool parseColumnsMatcherBody(IParser::Pos & pos, ASTPtr & node, Expected
auto list_matcher = std::make_shared<ASTColumnsListMatcher>();
list_matcher->column_list = std::move(column_list);
list_matcher->transformers = std::move(transformers);
list_matcher->children.push_back(list_matcher->column_list);
if (!transformers->children.empty())
{
list_matcher->transformers = std::move(transformers);
list_matcher->children.push_back(list_matcher->transformers);
}
node = std::move(list_matcher);
}
@ -1646,8 +1652,11 @@ static bool parseColumnsMatcherBody(IParser::Pos & pos, ASTPtr & node, Expected
auto regexp_matcher = std::make_shared<ASTColumnsRegexpMatcher>();
regexp_matcher->setPattern(regex_node->as<ASTLiteral &>().value.get<String>());
if (!transformers->children.empty())
{
regexp_matcher->transformers = std::move(transformers);
regexp_matcher->children.push_back(regexp_matcher->transformers);
}
node = std::move(regexp_matcher);
}
@ -1689,11 +1698,15 @@ bool ParserQualifiedColumnsMatcher::parseImpl(Pos & pos, ASTPtr & node, Expected
auto result = std::make_shared<ASTQualifiedColumnsListMatcher>();
result->qualifier = std::move(identifier_node);
result->column_list = std::move(columns_list_matcher->column_list);
result->transformers = std::move(columns_list_matcher->transformers);
result->children.push_back(result->qualifier);
result->children.push_back(result->column_list);
if (columns_list_matcher->transformers)
{
result->transformers = std::move(columns_list_matcher->transformers);
result->children.push_back(result->transformers);
}
node = std::move(result);
}
@ -1704,10 +1717,13 @@ bool ParserQualifiedColumnsMatcher::parseImpl(Pos & pos, ASTPtr & node, Expected
result->setMatcher(column_regexp_matcher->getMatcher());
result->qualifier = std::move(identifier_node);
result->transformers = std::move(column_regexp_matcher->transformers);
result->children.push_back(result->qualifier);
if (column_regexp_matcher->transformers)
{
result->transformers = std::move(column_regexp_matcher->transformers);
result->children.push_back(result->transformers);
}
node = std::move(result);
}

6
src/Parsers/ExpressionListParsers.cpp
View File

@ -194,11 +194,7 @@ static bool modifyAST(ASTPtr ast, SubqueryFunctionType type)
return false;
/// subquery --> (SELECT aggregate_function(*) FROM subquery)
auto asterisk = std::make_shared<ASTAsterisk>();
asterisk->transformers = std::make_shared<ASTExpressionList>();
asterisk->children.push_back(asterisk->transformers);
auto aggregate_function = makeASTFunction(aggregate_function_name, std::move(asterisk));
auto aggregate_function = makeASTFunction(aggregate_function_name, std::make_shared<ASTAsterisk>());
auto subquery_node = function->children[0]->children[1];
auto table_expression = std::make_shared<ASTTableExpression>();

5
src/Storages/WindowView/StorageWindowView.cpp
View File

@ -327,10 +327,7 @@ namespace
{
auto fetch_query = std::make_shared<ASTSelectQuery>();
auto select = std::make_shared<ASTExpressionList>();
auto asterisk = std::make_shared<ASTAsterisk>();
asterisk->transformers = std::make_shared<ASTExpressionList>();
asterisk->children.push_back(asterisk->transformers);
select->children.push_back(asterisk);
select->children.push_back(std::make_shared<ASTAsterisk>());
fetch_query->setExpression(ASTSelectQuery::Expression::SELECT, select);
fetch_query->setExpression(ASTSelectQuery::Expression::TABLES, std::make_shared<ASTTablesInSelectQuery>());
auto tables_elem = std::make_shared<ASTTablesInSelectQueryElement>();