system.settings_changes

説明

以前の ClickHouse バージョンにおける設定変更に関する情報を保持します。

カラム

• type (Enum8('Session' = 0, 'MergeTree' = 1)) — 設定の分類 (Session、MergeTree など)
• version (String) — ClickHouse サーバーのバージョン。
• changes (Array(Tuple(name String, previous_value String, new_value String, reason String))) — ClickHouse の動作に影響を与えた設定変更の一覧。

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.')]

関連項目

• Settings
• system.settings