diff --git a/docs/en/operations/system-tables/settings_changes.md b/docs/en/operations/system-tables/settings_changes.md new file mode 100644 index 00000000000..c097915d430 --- /dev/null +++ b/docs/en/operations/system-tables/settings_changes.md @@ -0,0 +1,32 @@ +--- +slug: /en/operations/system-tables/settings_changes +--- +# settings_changes + +Contains information about setting changes in previous ClickHouse versions. + +Columns: + +- `version` ([String](../../sql-reference/data-types/string.md)) — The ClickHouse version in which settings were changed +- `changes` ([Array](../../sql-reference/data-types/array.md) of [Tuple](../../sql-reference/data-types/tuple.md)) — A description of the setting changes: (setting name, previous value, new value, reason for the change) + +**Example** + +``` sql +SELECT * +FROM system.settings_changes +WHERE version = '23.5' +FORMAT Vertical +``` + +``` text +Row 1: +────── +version: 23.5 +changes: [('input_format_parquet_preserve_order','1','0','Allow Parquet reader to reorder rows for better parallelism.'),('parallelize_output_from_storages','0','1','Allow parallelism when executing queries that read from file/url/s3/etc. This may reorder rows.'),('use_with_fill_by_sorting_prefix','0','1','Columns preceding WITH FILL columns in ORDER BY clause form sorting prefix. Rows with different values in sorting prefix are filled independently'),('output_format_parquet_compliant_nested_types','0','1','Change an internal field name in output Parquet file schema.')] +``` + +**See also** + +- [Settings](../../operations/settings/index.md#session-settings-intro) +- [system.settings](settings.md)