Update doc according to pingcap/tidb#22860

pingcap/parser#609 pingcap/tidb#22860
nayuta-yanagisawa · Feb 27, 2021 · df30ae4 · df30ae4
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diff --git a/sql-statements/sql-statement-create-table.md b/sql-statements/sql-statement-create-table.md
@@ -170,7 +170,7 @@ mysql> DESC t1;
 
 ## MySQL compatibility
 
-* TiDB does not support temporary tables, but it ignores the `CREATE TEMPORARY TABLE` syntax.
+* TiDB does not support temporary tables. `CREATE TEMPORARY TABLE` and `DROP TEMPORARY TABLE` will return errors if and only if [`tidb_enable_noop_functions = 0`](/system-variables.md#tidb_enable_noop_functions-new-in-v40).
 * All of the data types except spatial types are supported.
 * `FULLTEXT`, `HASH` and `SPATIAL` indexes are not supported.
 * For compatibility, the `index_col_name` attribute supports the length option with a maximum length limit of 3072 bytes by default. The length limit can be changed through the `max-index-length` configuration option. For details, see [TiDB configuration file](/tidb-configuration-file.md#max-index-length).

diff --git a/system-variables.md b/system-variables.md
@@ -429,6 +429,8 @@ Constraint checking is always performed in place for pessimistic transactions (d
     * `get_lock` and `release_lock` functions
     * `LOCK IN SHARE MODE` syntax
     * `SQL_CALC_FOUND_ROWS` syntax
+    * `CREATE TEMPORARY TABLE` syntax
+    * `DROP TEMPORARY TABLE` syntax
 
 > **Note:**
 >