mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-20 08:40:50 +00:00
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
#pragma once
|
|
|
|
#include <unordered_set>
|
|
#include <unordered_map>
|
|
#include <vector>
|
|
|
|
#include <Common/randomSeed.h>
|
|
#include <Common/Stopwatch.h>
|
|
#include <Core/Field.h>
|
|
#include <Parsers/IAST.h>
|
|
|
|
namespace DB
|
|
{
|
|
|
|
/*
|
|
* This is an AST-based query fuzzer that makes random modifications to query
|
|
* AST, changing numbers, list of columns, functions, etc. It remembers part of
|
|
* queries it fuzzed previously, and can substitute these parts to new fuzzed
|
|
* queries, so you want to feed it a lot of queries to get some interesting mix
|
|
* of them. Normally we feed SQL regression tests to it.
|
|
*/
|
|
struct QueryFuzzer
|
|
{
|
|
pcg64 fuzz_rand{randomSeed()};
|
|
|
|
// These arrays hold parts of queries that we can substitute into the query
|
|
// we are currently fuzzing. We add some part from each new query we are asked
|
|
// to fuzz, and keep this state between queries, so the fuzzing output becomes
|
|
// more interesting over time, as the queries mix.
|
|
std::unordered_set<std::string> aliases_set;
|
|
std::vector<std::string> aliases;
|
|
|
|
std::unordered_map<std::string, ASTPtr> column_like_map;
|
|
std::vector<ASTPtr> column_like;
|
|
|
|
std::unordered_map<std::string, ASTPtr> table_like_map;
|
|
std::vector<ASTPtr> table_like;
|
|
|
|
// This is the only function you have to call -- it will modify the passed
|
|
// ASTPtr to point to new AST with some random changes.
|
|
void fuzzMain(ASTPtr & ast);
|
|
|
|
// Variuos helper functions follow, normally you shouldn't have to call them.
|
|
Field getRandomField(int type);
|
|
Field fuzzField(Field field);
|
|
ASTPtr getRandomColumnLike();
|
|
void replaceWithColumnLike(ASTPtr & ast);
|
|
void replaceWithTableLike(ASTPtr & ast);
|
|
void fuzzColumnLikeExpressionList(ASTPtr ast);
|
|
void fuzz(ASTs & asts);
|
|
void fuzz(ASTPtr & ast);
|
|
void collectFuzzInfoMain(const ASTPtr ast);
|
|
void addTableLike(const ASTPtr ast);
|
|
void addColumnLike(const ASTPtr ast);
|
|
void collectFuzzInfoRecurse(const ASTPtr ast);
|
|
};
|
|
|
|
}
|