[IMPALA-4158] Warn about parquet schema evolution

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Impala 2.5.0
• Component/s: Backend
• Labels: supportability
• Assignee: Unassigned
• Reporter: Marcell Szabo
• Created: 19/Sep/16 16:29
• Updated: 28/Sep/16 16:26

Description

Impala should show a warning (in the resultset and the log as well) if the schema in the metastore does not match the schema in the parquet files. Especially when the Hive-style vs. Impala-style schema evolution would give different results (see IMPALA-2835).

On the other hand the admin/user should be able to supress this warning, e.g. through: startup option, query option, table properties