Added EXTRACT(<time unit> FROM <date/datetime/time col) as pruning fu…

…nction
pingcap · Aug 4, 2024 · e3bedaf · e3bedaf
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diff --git a/partition-pruning.md b/partition-pruning.md
@@ -240,6 +240,7 @@ If the `fn` function is monotonous, for any `x` and `y`, if `x > y`, then `fn(x)
 
 * [`UNIX_TIMESTAMP()`](/functions-and-operators/date-and-time-functions.md)
 * [`TO_DAYS()`](/functions-and-operators/date-and-time-functions.md)
+* [`EXTRACT(<time unit> FROM <DATETIME/DATE/TIME column>)`](/functions-and-operators/date-and-time-functions.md); For DATE and DATETIME columns YEAR, and YEAR_MONTH time units are considered monotonous functions, and for TIME columns HOUR, HOUR_MINUTE, HOUR_SECOND and HOUR_MICROSECOND are considered monotonous. Also note that WEEK is not supported as time unit in EXTRACT for partition pruning.
 
 For example, partition pruning takes effect when the partition expression is in the form of `fn(col)`, where the `fn` is monotonous function `to_days`:
 

diff --git a/partitioned-table.md b/partitioned-table.md
@@ -1310,6 +1310,7 @@ Currently, partition pruning does not work with `LIKE` conditions.
 
     * [`UNIX_TIMESTAMP()`](/functions-and-operators/date-and-time-functions.md)
     * [`TO_DAYS()`](/functions-and-operators/date-and-time-functions.md)
+    * [`EXTRACT(<time unit> FROM <DATETIME/DATE/TIME column>)`](/functions-and-operators/date-and-time-functions.md); For DATE and DATETIME columns YEAR, and YEAR_MONTH time units are considered monotonous functions, and for TIME columns HOUR, HOUR_MINUTE, HOUR_SECOND and HOUR_MICROSECOND are considered monotonous. Also note that WEEK is not supported as time unit in EXTRACT for partition pruning.
 
     For example, the partition expression is a simple column: