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https://issues.apache.org/jira/browse/FLINK-39758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Leonard Xu reassigned FLINK-39758:
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Assignee: Mao Jiayi
> Fix DECIMAL OOB in SchemaMergingUtils
> -------------------------------------
>
> Key: FLINK-39758
> URL: https://issues.apache.org/jira/browse/FLINK-39758
> Project: Flink
> Issue Type: Bug
> Components: Flink CDC
> Reporter: Mao Jiayi
> Assignee: Mao Jiayi
> Priority: Major
> Labels: pull-request-available
>
> When merging DECIMAL types from multiple tables in a route-merge pipeline,
> the job may fail if the computed result precision exceeds the maximum allowed
> value.
> The failure happens in *SchemaMergingUtils.mergeDecimalTypes()* and
> {*}SchemaUtils.inferWiderType(){*}. The current implementation calculates the
> merged precision as {{{}max(lhsIntDigits, rhsIntDigits) + max(lhsScale,
> rhsScale){}}}, and then uses *Preconditions.checkArgument* to enforce that
> this value must not exceed {*}DecimalType.MAX_PRECISION (38){*}. When the sum
> exceeds 38, an *IllegalArgumentException* is thrown and the entire pipeline
> fails.
> This issue is typically exposed in multi-table route-merge scenarios where
> tables from different data sources have DECIMAL columns with significantly
> different precisions and scales.
> This issue is not specific to any particular source connector. It can affect
> any pipeline that uses route-merge to combine tables with mismatched DECIMAL
> precisions.
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