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Omit EXPLAIN FORMAT for old TCP clients.

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Nikolai Kochetov 2021-04-14 18:59:08 +03:00
parent 3f7cee1149
commit 4c37d461de
1 changed files with 9 additions and 0 deletions
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9
src/Interpreters/executeQuery.cpp
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@ -383,6 +383,15 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
ast = parseQuery(parser, begin, end, "", max_query_size, settings.max_parser_depth);
#endif
if (auto * ast_explain = typeid_cast<ASTExplainQuery *>(ast.get()))
{
const auto & client_info = context.getClientInfo();
/// Ignore format for old clients to ignore exception. Always return human-readable output.
if (client_info.interface == ClientInfo::Interface::TCP &&
(client_info.client_version_major < 21 || client_info.client_version_minor < 5))
ast_explain->format = nullptr;
}
/// Interpret SETTINGS clauses as early as possible (before invoking the corresponding interpreter),
/// to allow settings to take effect.
if (const auto * select_query = ast->as<ASTSelectQuery>())