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pengxiangyu 599ecb1f30 [Function] Add bitmap function bitmap_subset_limit (#6980 )

Add bitmap function bitmap_subset_limit.
This function will return subset in specified index.

2021-11-04 12:14:47 +08:00

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title, language

title	language
bitmap_subset_limit	en

bitmap_subset_limit

Description

Syntax

BITMAP BITMAP_SUBSET_LIMIT(BITMAP src, BIGINT range_start, BIGINT cardinality_limit)

Create subset of the BITMAP, begin with range from range_start, limit by cardinality_limit range_start：start value for the range cardinality_limit：subset upper limit

example

mysql> select bitmap_to_string(bitmap_subset_limit(bitmap_from_string('1,2,3,4,5'), 0, 3)) value;
+-----------+
| value     |
+-----------+
| 1,2,3 |
+-----------+

mysql> select bitmap_to_string(bitmap_subset_limit(bitmap_from_string('1,2,3,4,5'), 4, 3)) value;
+-------+
| value |
+-------+
| 4，5     |
+-------+

keyword

BITMAP_SUBSET_LIMIT,BITMAP_SUBSET,BITMAP

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