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81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
#pragma once
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#include <unordered_set>
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#include <unordered_map>
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#include <vector>
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#include <pcg-random/pcg_random.hpp>
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#include <Common/randomSeed.h>
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#include <Core/Field.h>
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#include <Parsers/IAST.h>
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namespace DB
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{
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class ASTExpressionList;
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class ASTOrderByElement;
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struct ASTWindowDefinition;
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/*
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* This is an AST-based query fuzzer that makes random modifications to query
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* AST, changing numbers, list of columns, functions, etc. It remembers part of
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* queries it fuzzed previously, and can substitute these parts to new fuzzed
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* queries, so you want to feed it a lot of queries to get some interesting mix
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* of them. Normally we feed SQL regression tests to it.
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*/
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struct QueryFuzzer
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{
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pcg64 fuzz_rand{randomSeed()};
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// We add elements to expression lists with fixed probability. Some elements
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// are so large, that the expected number of elements we add to them is
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// one or higher, hence this process might never finish. Put some limit on the
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// total depth of AST to prevent this.
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// This field is reset for each fuzzMain() call.
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size_t current_ast_depth = 0;
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// These arrays hold parts of queries that we can substitute into the query
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// we are currently fuzzing. We add some part from each new query we are asked
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// to fuzz, and keep this state between queries, so the fuzzing output becomes
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// more interesting over time, as the queries mix.
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std::unordered_set<std::string> aliases_set;
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std::vector<std::string> aliases;
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std::unordered_map<std::string, ASTPtr> column_like_map;
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std::vector<ASTPtr> column_like;
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std::unordered_map<std::string, ASTPtr> table_like_map;
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std::vector<ASTPtr> table_like;
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// Some debug fields for detecting problematic ASTs with loops.
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// These are reset for each fuzzMain call.
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std::unordered_set<const IAST *> debug_visited_nodes;
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ASTPtr * debug_top_ast = nullptr;
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// This is the only function you have to call -- it will modify the passed
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// ASTPtr to point to new AST with some random changes.
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void fuzzMain(ASTPtr & ast);
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// Various helper functions follow, normally you shouldn't have to call them.
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Field getRandomField(int type);
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Field fuzzField(Field field);
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ASTPtr getRandomColumnLike();
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void replaceWithColumnLike(ASTPtr & ast);
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void replaceWithTableLike(ASTPtr & ast);
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void fuzzOrderByElement(ASTOrderByElement * elem);
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void fuzzOrderByList(IAST * ast);
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void fuzzColumnLikeExpressionList(IAST * ast);
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void fuzzWindowFrame(ASTWindowDefinition & def);
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void fuzz(ASTs & asts);
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void fuzz(ASTPtr & ast);
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void collectFuzzInfoMain(const ASTPtr ast);
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void addTableLike(const ASTPtr ast);
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void addColumnLike(const ASTPtr ast);
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void collectFuzzInfoRecurse(const ASTPtr ast);
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};
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}
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