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Merge pull request #47573 from azat/odbc-fix

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Change error code in case of columns definitions was empty in ODBC
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robot-ch-test-poll3 2023-03-15 12:31:54 +01:00 committed by GitHub
commit 9d14c14a54
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1 changed files with 13 additions and 2 deletions
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15
programs/odbc-bridge/ColumnInfoHandler.cpp
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@ -30,7 +30,7 @@ namespace DB
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int UNKNOWN_TABLE;
extern const int BAD_ARGUMENTS;
}
@ -180,8 +180,19 @@ void ODBCColumnsInfoHandler::handleRequest(HTTPServerRequest & request, HTTPServ
columns.emplace_back(column_name, std::move(column_type));
}
/// Usually this should not happen, since in case of table does not
/// exists, the call should be succeeded.
/// However it is possible sometimes because internally there are two
/// queries in ClickHouse ODBC bridge:
/// - system.tables
/// - system.columns
/// And if between this two queries the table will be removed, them
/// there will be no columns
///
/// Also sometimes system.columns can return empty result because of
/// the cached value of total tables to scan.
if (columns.empty())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Columns definition was not returned");
throw Exception(ErrorCodes::UNKNOWN_TABLE, "Columns definition was not returned");
WriteBufferFromHTTPServerResponse out(
response,