[jira] [Updated] (PIG-4018) Schema validation fails with UNION ONSCHEMA

["Travis Woodruff (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-4018?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Travis Woodruff updated PIG-4018:
---------------------------------

    Affects Version/s: 0.13.0

> Schema validation fails with UNION ONSCHEMA
> -------------------------------------------
>
>                 Key: PIG-4018
>                 URL: https://issues.apache.org/jira/browse/PIG-4018
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.13.0
>            Reporter: Travis Woodruff
>            Assignee: Travis Woodruff
>
> When relations with differing schemas are unioned (using UNION ONSCHEMA), schema validation can fail with this exception:
> {{org.apache.pig.impl.plan.PlanValidationException: Logical plan invalid state: invalid uid -1 in schema}}
> This worked before the fix for PIG-3492.
> The merged schema (from {{LOUnion.getSchema()}}) does not contain uids for columns not in the schema of the first input (uids are set to -1). This is because only the first input's schema is used for looking up "cached" uids.
> Normally, this isn't a problem because {{UnionOnSchemaSetter}} comes along and fixes the missing fields.
> However, when {{ImplicitSplitInsertVisitor}} is active, it is called before {{UnionOnSchemaSetter}}. {{ImplicitSplitInsertVisitor}} calls {{schemaResetter.visit()}}, which throws the validation exception because {{UnionOnSchemaSetter}} has not had a chance to create the missing fields (and this uids are still -1 for these fields).



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