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bitmap_empty.md

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bitmap_empty

description

Syntax

BITMAP BITMAP_EMPTY()

返回一个空bitmap。主要用于 insert 或 stream load 时填充默认值。例如

cat data | curl --location-trusted -u user:passwd -T - \
    -H "columns: dt,page,v1,v2=bitmap_empty()" \
    http://host:8410/api/test/testDb/_stream_load

example

MySQL > select bitmap_count(bitmap_empty());
+------------------------------+
| bitmap_count(bitmap_empty()) |
+------------------------------+
|                            0 |
+------------------------------+

keyword

BITMAP_EMPTY,BITMAP