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https://issues.apache.org/jira/browse/NIFI-7711?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pierre Villard resolved NIFI-7711.
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Resolution: Feedback Received
Apache NiFi 1.x is no longer maintained and no new release is planned on the
1.x release line. Marking as resolved as part of a cleanup operation. Please
open a new one with an updated description if this is still relevant for NiFi
2.x.
> GenerateTableFetch generates fetch on empty table
> -------------------------------------------------
>
> Key: NIFI-7711
> URL: https://issues.apache.org/jira/browse/NIFI-7711
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Affects Versions: 1.11.4
> Reporter: Daniel Lorych
> Priority: Minor
>
> h6. Description
> GenerateTableFetch generates "select all" where clause (1=1) for an empty
> table, which leads to inconsistent state (and duplicate flowfiles).
> Generated SQL statement (1=1) can return values, which were created after
> collecting max values during statement generation. On a subsequent run, with
> existing data, the statement will contain a where clause with maxValue
> limited.
> h6. Environment:
> * Table is empty
> * 'Maximum-value Columns' property is set to PK
> * 'Partition Size' property set to 0
>
> h6. Expected behaviour:
> No or empty flowfile should be generated.
> h6. Root Cause:
> `numberOfFetches` is calculated incorrectly for `partitionSize == 0`.
> Calculation should take into account returned `rowCount`.
> [GenerateTableFetch.java#L462|https://github.com/apache/nifi/blob/4d940bb151eb8d250b0319318b96d23c4a9819ae/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/GenerateTableFetch.java#L462]
> h6. Possible fix:
> {code:java}
> numberOfFetches = (partitionSize == 0) ? (rowCount == 0 ? 0 : 1) : (rowCount
> / partitionSize) + (rowCount % partitionSize == 0 ? 0 : 1);
> {code}
>
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