settings_changes

包含有关先前 ClickHouse 版本中设置更改的信息。

列

• type (Enum) - 设置类型：Core（通用/查询设置），MergeTree。
• version (String) — 更改设置的 ClickHouse 版本
• changes (Array of Tuple) — 设置更改的描述：（设置名称、先前值、新值、更改原因）

示例

SELECT *
FROM system.settings_changes
WHERE version = '23.5'
FORMAT Vertical

Row 1:
──────
type:    Core
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.')]

参见

• 设置
• system.settings