ClickHouse/dbms/include/DB/Analyzers/AnalyzeLambdas.h

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#pragma once
#include <DB/Parsers/IAST.h>
#include <vector>
namespace DB
{
class WriteBuffer;
/** For every lambda expression, rename its parameters to '_lambda0_arg0' form.
* Check correctness of lambda expressions.
* Find functions, that have lambda expressions as arguments (they are called "higher order" functions).
*
* This should be done before CollectAliases.
*/
struct AnalyzeLambdas
{
void process(ASTPtr & ast);
/// Parameters of lambda expressions.
using LambdaParameters = std::vector<String>;
static LambdaParameters extractLambdaParameters(ASTPtr & ast);
using HigherOrderFunctions = std::vector<ASTPtr>;
HigherOrderFunctions higher_order_functions;
/// Debug output
void dump(WriteBuffer & out) const;
};
}