From cb7f6e1c1ff52571bfcade89055d841510220961 Mon Sep 17 00:00:00 2001 From: Frank945946 <108602632+Frank945946@users.noreply.github.com> Date: Tue, 19 Dec 2023 15:49:53 +0800 Subject: [PATCH] This is an automated cherry-pick of #15787 Signed-off-by: ti-chi-bot --- mysql-schema.md | 1 - tidb-distributed-execution-framework.md | 10 ++++++++++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/mysql-schema.md b/mysql-schema.md index e02fcf2796106..8c29e308acacf 100644 --- a/mysql-schema.md +++ b/mysql-schema.md @@ -98,7 +98,6 @@ Currently, the `help_topic` is NULL. - `GLOBAL_VARIABLES`: global system variable table - `expr_pushdown_blacklist`: the blocklist for expression pushdown - `opt_rule_blacklist`: the blocklist for logical optimization rules -- `table_cache_meta`: the metadata of cached tables - `tidb_import_jobs`: the job information of [`IMPORT INTO`](/sql-statements/sql-statement-import-into.md) - `tidb_timers`: the metadata of internal timers diff --git a/tidb-distributed-execution-framework.md b/tidb-distributed-execution-framework.md index 9838b72e36cef..b68e58abfcda7 100644 --- a/tidb-distributed-execution-framework.md +++ b/tidb-distributed-execution-framework.md @@ -60,6 +60,16 @@ Currently, for TiDB Self-Hosted, the TiDB backend task distributed execution fra - `IMPORT INTO` is used to import data in formats such as `CSV`, `SQL`, and `PARQUET` into an empty table. For more information, see [`IMPORT INTO`](https://docs.pingcap.com/tidb/v7.2/sql-statement-import-into). +<<<<<<< HEAD +======= + + +## Limitation + +- The DXF can only schedule the distributed execution of one `ADD INDEX` task at a time. If a new `ADD INDEX` task is submitted before the current `ADD INDEX` distributed task has finished, the new task is executed through a transaction. +- Adding indexes on columns with the `TIMESTAMP` data type through the DXF is not supported, because it might lead to inconsistency between the index and the data. + +>>>>>>> c56885347e (DXF: add a limitation that adding indexes to columns of `TIMESTAMP` data type via the DXF is not supported (#15787)) ## Prerequisites Before using the distributed framework, you need to enable the [Fast Online DDL](/system-variables.md#tidb_ddl_enable_fast_reorg-new-in-v630) mode.