[
https://issues.apache.org/jira/browse/BEAM-10379?focusedWorklogId=498705&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-498705
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ASF GitHub Bot logged work on BEAM-10379:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 09/Oct/20 19:21
Start Date: 09/Oct/20 19:21
Worklog Time Spent: 10m
Work Description: ibzib opened a new pull request #13062:
URL: https://github.com/apache/beam/pull/13062
The incorrect behavior when mixing null and non-null values is still present.
bit_and is still excluded from ZetaSQL.
R: @amaliujia
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Issue Time Tracking
-------------------
Worklog Id: (was: 498705)
Remaining Estimate: 0h
Time Spent: 10m
> Some problems when implementing BIT_AND aggregation function in BeamSQL
> -----------------------------------------------------------------------
>
> Key: BEAM-10379
> URL: https://issues.apache.org/jira/browse/BEAM-10379
> Project: Beam
> Issue Type: Task
> Components: dsl-sql, dsl-sql-zetasql
> Reporter: Yuwei Fu
> Assignee: Shehzaad Nakhoda
> Priority: P2
> Labels: stale-assigned, starter
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Performs a bitwise AND operation on expression and returns the result.
> Supported Argument Types: INT64
> Returned Data Types: INT64
> Examples
> {code:sql}
> SELECT BIT_AND(c) as bit_and FROM UNNEST([0xF001, 0x00A1]) as c;
> +---------+
> | bit_and |
> +---------+
> | 1 |
> +---------+
> {code}
>
> What is expected: should include both Calcite and ZetaSQL dialects.
> How to test: unit tests
> Reference:
> [https://cloud.google.com/bigquery/docs/reference/standard-sql/aggregate_functions#bit_and]
>
> Problems:
> After implementation, the current situation is:
> 1. When table is empty, the result is empty, correct.
> 2. When table contains only null values, the result is null, correct.
> 3. When table contains only valid numerical values, the result is as
> expected, correct.
> 4. When table contains both valid numerical values and null values, the
> result should be null (BitAnd(null, val) = null). But it seems all null
> values have been directly ignored before doing the bit_and operation. Only
> numerical values are taken into operation, so the result is incorrect.
>
> It turns out that on direct runner, NULL will not be passed to CombineFn thus
> all NULL inputs are ignored. And then if there is any non-null inputs,
> bit_and will be applied on them only, which leads to a non-null result, which
> is not correct.
> Before figuring out the root cause and proposing a fix, the previous
> implementation of BIT_AND is reverted.
>
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