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#include <Interpreters/RewriteArrayExistsFunctionVisitor.h>
#include <Parsers/ASTFunction.h>
#include <Parsers/ASTIdentifier.h>
#include <Parsers/ASTLiteral.h>
namespace DB
{
void RewriteArrayExistsFunctionMatcher::visit(ASTPtr & ast, Data & data)
{
if (auto * func = ast->as<ASTFunction>())
{
if (func->is_window_function)
return;
visit(*func, ast, data);
}
}
void RewriteArrayExistsFunctionMatcher::visit(const ASTFunction & func, ASTPtr & ast, Data &)
{
if (func.name != "arrayExists" || !func.arguments)
return;
auto & array_exists_arguments = func.arguments->children;
if (array_exists_arguments.size() != 2)
return;
/// lambda function must be like: x -> x = elem
const auto * lambda_func = array_exists_arguments[0]->as<ASTFunction>();
if (!lambda_func || !lambda_func->is_lambda_function)
return;
const auto & lambda_func_arguments = lambda_func->arguments->children;
if (lambda_func_arguments.size() != 2)
return;
const auto * tuple_func = lambda_func_arguments[0]->as<ASTFunction>();
if (!tuple_func || tuple_func->name != "tuple")
return;
const auto & tuple_arguments = tuple_func->arguments->children;
if (tuple_arguments.size() != 1)
return;
const auto * id = tuple_arguments[0]->as<ASTIdentifier>();
if (!id)
return;
const auto * filter_func = lambda_func_arguments[1]->as<ASTFunction>();
if (!filter_func || filter_func->name != "equals")
return;
auto & filter_arguments = filter_func->arguments->children;
if (filter_arguments.size() != 2)
return;
const ASTIdentifier * filter_id = nullptr;
if ((filter_id = filter_arguments[0]->as<ASTIdentifier>()) && filter_arguments[1]->as<ASTLiteral>()
&& filter_id->full_name == id->full_name)
{
/// arrayExists(x -> x = elem, arr) -> has(arr, elem)
auto new_func = makeASTFunction("has", std::move(array_exists_arguments[1]), std::move(filter_arguments[1]));
new_func->setAlias(func.alias);
ast = std::move(new_func);
return;
}
else if (
(filter_id = filter_arguments[1]->as<ASTIdentifier>()) && filter_arguments[0]->as<ASTLiteral>()
&& filter_id->full_name == id->full_name)
{
/// arrayExists(x -> elem = x, arr) -> has(arr, elem)
auto new_func = makeASTFunction("has", std::move(array_exists_arguments[1]), std::move(filter_arguments[0]));
new_func->setAlias(func.alias);
ast = std::move(new_func);
return;
}
}
}
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