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add diagnostic information when two merge tables try to read each other's data

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root 2020-12-07 15:23:58 +08:00
parent dd8362a5eb
commit e07374331a
1 changed files with 9 additions and 1 deletions
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10
src/Storages/StorageMerge.cpp
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@ -430,7 +430,15 @@ StorageMerge::StorageListWithLocks StorageMerge::getSelectedTables(
DatabaseTablesIteratorPtr StorageMerge::getDatabaseIterator(const Context & context) const
{
checkStackSize();
try
{
checkStackSize();
}
catch (Exception & e)
{
e.addMessage("while getting table iterator of Merge table. Maybe caused by two Merge tables that will endlessly try to read each other's data");
throw;
}
auto database = DatabaseCatalog::instance().getDatabase(source_database);
auto table_name_match = [this](const String & table_name_) { return table_name_regexp.match(table_name_); };
return database->getTablesIterator(context, table_name_match);