**Use case**

If FixedString is used with more than 256 bytes in size, it is suspicious and most likely indicates misusage.
Forbid this by default and add a setting to override it; ATTACH queries should allow creating tables nevertheless.

See also: `allow_suspicious_low_cardinality_types`.

\
    M(UInt64, min_execution_speed, 0, "Minimum number of execution rows per second.", 0) \
    M(UInt64, max_execution_speed, 0, "Maximum number of execution rows per second.", 0) \
    M(UInt64, min_execution_speed_bytes, 0, "Minimum number of execution bytes per second.", 0) \
    M(UInt64, max_execution_speed_bytes, 0, "Maximum number of execution bytes per second.", 0) \
    M(Seconds, timeout_before_checking_execution_speed, 10, "Check that the speed is not too low after the specified time has elapsed.", 0) \
    \
    M(UInt64, max_columns_to_read, 0, "If a query requires reading more than specified number of columns, exception is thrown. Zero value means unlimited. This setting is useful to prevent too complex queries.", 0) \
    M(UInt64, max_temporary_columns, 0, "If a query generates more than the specified number of temporary columns in memory as a result of intermediate calculation, exception is thrown. Zero value means unlimited. This setting is useful to prevent too complex queries.", 0) \
    M(UInt64, max_temporary_non_const_columns, 0, "Similar to the 'max_temporary_columns' setting but applies only to non-constant columns. This makes sense, because constant columns are cheap and it is reasonable to allow more of them.", 0) \
    \
    M(UInt64, max_subquery_depth, 100, "If a query has more than specified number of nested subqueries, throw an exception. This allows you to have a sanity check to protect the users of your cluster from going insane with their queries.", 0) \
    M(UInt64, max_analyze_depth, 5000, "Maximum number of analyses performed by interpreter.", 0) \
    M(UInt64, max_ast_depth, 1000, "Maximum depth of query syntax tree. Checked after parsing.", 0) \
    M(UInt64, max_ast_elements, 50000, "Maximum size of query syntax tree in number of nodes. Checked after parsing.", 0) \
    M(UInt64, max_expanded_ast_elements, 500000, "Maximum size of query syntax tree in number of nodes after expansion of aliases and the asterisk.", 0) \
    \
    M(UInt64, readonly, 0, "0 - no read-only restrictions. 1 - only read requests, as well as changing explicitly allowed settings. 2 - only read requests, as well as changing settings, except for the 'readonly' setting.", 0) \
    \
    M(UInt64, max_rows_in_set, 0, "Maximum size of the set (in number of elements) resulting from the execution of the IN section.", 0) \
    M(UInt64, max_bytes_in_set, 0, "Maximum size of the set (in bytes in memory) resulting from the execution of the IN section.", 0) \
    M(OverflowMode, set_overflow_mode, OverflowMode::THROW, "What to do when the limit is exceeded.", 0) \
    \
    M(UInt64, max_rows_in_join, 0, "Maximum size of the hash table for JOIN (in number of rows).", 0) \
    M(UInt64, max_bytes_in_join, 0, "Maximum size of the hash table for JOIN (in number of bytes in memory).", 0) \
    M(OverflowMode, join_overflow_mode, OverflowMode::THROW, "What to do when the limit is exceeded.", 0) \
    M(Bool, join_any_take_last_row, false, "When disabled (default) ANY JOIN will take the first found row for a key. When enabled, it will take the last row seen if there are multiple rows for the same key.", IMPORTANT) \
    M(JoinAlgorithm, join_algorithm, JoinAlgorithm::DEFAULT, "Specify join algorithm.", 0) \
    M(UInt64, default_max_bytes_in_join, 1000000000, "Maximum size of right-side table if limit is required but max_bytes_in_join is not set.", 0) \
    M(UInt64, partial_merge_join_left_table_buffer_bytes, 0, "If not 0 group left table blocks in bigger ones for left-side table in partial merge join. It uses up to 2x of specified memory per joining thread.", 0) \