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#include <Parsers/ASTExpressionList.h>
#include <Parsers/ASTIdentifier_fwd.h>
#include <Parsers/ASTSubquery.h>
#include <Parsers/ASTWithElement.h>
#include <Parsers/CommonParsers.h>
#include <Parsers/ExpressionElementParsers.h>
#include <Parsers/ExpressionListParsers.h>
#include <Parsers/ParserWithElement.h>
namespace DB
{
bool ParserWithElement::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
{
ParserIdentifier s_ident;
ParserKeyword s_as("AS");
ParserSubquery s_subquery;
auto old_pos = pos;
if (ASTPtr name, subquery;
s_ident.parse(pos, name, expected) && s_as.ignore(pos, expected) && s_subquery.parse(pos, subquery, expected))
{
auto with_element = std::make_shared<ASTWithElement>();
tryGetIdentifierNameInto(name, with_element->name);
with_element->subquery = subquery;
with_element->children.push_back(with_element->subquery);
node = with_element;
}
else
{
pos = old_pos;
ParserExpressionWithOptionalAlias s_expr(false);
if (!s_expr.parse(pos, node, expected))
return false;
}
return true;
}
}
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