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check formatting only for the queries we can execute
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parent
e485a27dc1
commit
6403198c84
@ -1372,65 +1372,6 @@ private:
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continue;
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}
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// Check that the query is formatted properly and we can parse
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// it back and format again and get the same result. Unfortunately
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// we can't compare the ASTs, which would be more sensitive to
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// errors. This double formatting check doesn't catch all errors,
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// e.g. we can format query incorrectly, but to a valid SQL that
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// we can then parse and format into the same SQL.
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{
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ASTPtr parsed_formatted_query;
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try
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{
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const auto * tmp_pos = fuzzed_text.c_str();
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parsed_formatted_query = parseQuery(tmp_pos,
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tmp_pos + fuzzed_text.size(),
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false /* allow_multi_statements */);
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}
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catch (Exception & e)
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{
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// Some complicated cases where we can generate the SQL
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// which we can't parse:
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// * first argument of lambda() replaced by fuzzer with
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// something else, leading to constructs such as
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// arrayMap((min(x) + 3) -> x + 1, ....)
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// * internals of Enum replaced, leading to:
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// Enum(equals(someFunction(y), 3)).
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// We could filter them on case-by-case basis, but they
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// are probably also helpful in that they test the parsing
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// errors, so let's just ignore them in this check and
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// send them to the server normally.
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if (e.code() != ErrorCodes::SYNTAX_ERROR)
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{
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throw;
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}
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}
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if (parsed_formatted_query)
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{
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const auto formatted_twice
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= parsed_formatted_query->formatForErrorMessage();
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if (formatted_twice != fuzzed_text)
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{
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fmt::print(stderr, "The query formatting is broken.\n");
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printChangedSettings();
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fmt::print(stderr, "Got the following (different) text after formatting the fuzzed query and parsing it back:\n'{}'\n, expected:\n'{}'\n",
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formatted_twice, fuzzed_text);
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fmt::print(stderr, "In more detail:\n");
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fmt::print(stderr, "AST-1:\n'{}'\n", ast_to_process->dumpTree());
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fmt::print(stderr, "Text-1 (AST-1 formatted):\n'{}'\n", fuzzed_text);
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fmt::print(stderr, "AST-2 (Text-1 parsed):\n'{}'\n", parsed_formatted_query->dumpTree());
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fmt::print(stderr, "Text-2 (AST-2 formatted):\n'{}'\n", formatted_twice);
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fmt::print(stderr, "Text-1 must be equal to Text-2, but it is not.\n");
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exit(1);
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}
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}
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}
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parsed_query = ast_to_process;
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query_to_send = parsed_query->formatForErrorMessage();
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@ -1470,6 +1411,67 @@ private:
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return false;
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}
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// Check that after the query is formatted, we can parse it back,
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// format again and get the same result. Unfortunately, we can't
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// compare the ASTs, which would be more sensitive to errors. This
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// double formatting check doesn't catch all errors, e.g. we can
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// format query incorrectly, but to a valid SQL that we can then
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// parse and format into the same SQL.
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// There are some complicated cases where we can generate the SQL
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// which we can't parse:
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// * first argument of lambda() replaced by fuzzer with
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// something else, leading to constructs such as
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// arrayMap((min(x) + 3) -> x + 1, ....)
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// * internals of Enum replaced, leading to:
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// Enum(equals(someFunction(y), 3)).
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// And there are even the cases when we can parse the query, but
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// it's logically incorrect and its formatting is a mess, such as
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// when `lambda()` function gets substituted into a wrong place.
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// To avoid dealing with these cases, run the check only for the
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// queries we were able to successfully execute.
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if (!have_error)
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{
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ASTPtr parsed_formatted_query;
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try
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{
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const auto * tmp_pos = query_to_send.c_str();
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parsed_formatted_query = parseQuery(tmp_pos,
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tmp_pos + query_to_send.size(),
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false /* allow_multi_statements */);
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}
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catch (Exception & e)
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{
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if (e.code() != ErrorCodes::SYNTAX_ERROR)
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{
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throw;
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}
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}
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if (parsed_formatted_query)
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{
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const auto formatted_twice
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= parsed_formatted_query->formatForErrorMessage();
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if (formatted_twice != query_to_send)
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{
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fmt::print(stderr, "The query formatting is broken.\n");
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printChangedSettings();
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fmt::print(stderr, "Got the following (different) text after formatting the fuzzed query and parsing it back:\n'{}'\n, expected:\n'{}'\n",
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formatted_twice, query_to_send);
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fmt::print(stderr, "In more detail:\n");
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fmt::print(stderr, "AST-1:\n'{}'\n", parsed_query->dumpTree());
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fmt::print(stderr, "Text-1 (AST-1 formatted):\n'{}'\n", query_to_send);
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fmt::print(stderr, "AST-2 (Text-1 parsed):\n'{}'\n", parsed_formatted_query->dumpTree());
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fmt::print(stderr, "Text-2 (AST-2 formatted):\n'{}'\n", formatted_twice);
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fmt::print(stderr, "Text-1 must be equal to Text-2, but it is not.\n");
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exit(1);
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}
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}
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}
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// The server is still alive so we're going to continue fuzzing.
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// Determine what we're going to use as the starting AST.
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if (have_error)
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