v2.7.4

NEW FEATURES

• add clickhouse.parts_columns_max_bytes_before_external_group_by (env CLICKHOUSE_PARTS_COLUMNS_MAX_BYTES_BEFORE_EXTERNAL_GROUP_BY, default 100000000) and clickhouse.parts_columns_max_memory_usage (env CLICKHOUSE_PARTS_COLUMNS_MAX_MEMORY_USAGE, default 200000000) — make the memory caps injected into the system.parts_columns check query configurable instead of hardcoded, 0 means don't inject the corresponding setting (pre-2.7.2 behavior), fix #1420

BUG FIXES

• fix --restore-database-mapping/--restore-table-mapping losing unrelated comma-separated --tables pattern items, or applying the mapping to the wrong item when the same source database/table name was repeated across items — each comma-separated pattern item is now matched and substituted independently, fix #1421