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doris/be
weizuo93 312dc83118 [Bug][BloomFilter] Fix bloom filter null flag (#6367)
Fix #6366 

There is a bloom filter for each data page in a column which has bloom filter index.
`_has_null` flag can help to judge whether `null` exists in a data page.
If `null` value is added to a data page, `_has_null` will be set `true`.
After bloom filter for a data page finished, `_has_null`should be reset to `false` to prepare for next data page.
2021-08-10 10:13:30 +08:00
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