szlta commented on a change in pull request #2586:
URL: https://github.com/apache/hive/pull/2586#discussion_r700194971
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File path: ql/src/java/org/apache/hadoop/hive/ql/io/orc/OrcInputFormat.java
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@@ -2693,6 +2696,77 @@ public static TypeDescription
getDesiredRowTypeDescr(Configuration conf,
return result;
}
+ /**
+ * Based on the file schema and the low level file includes provided in the
SchemaEvolution instance, this method
+ * calculates which top level columns should be included i.e. if any of the
nested columns inside complex types is
+ * required, then its relevant top level parent column will be considered as
required (and thus the full subtree).
+ * Hive and LLAP currently only supports column pruning on the first level,
thus we need to calculate this ourselves.
Review comment:
ACID is a special case, and I think it does. For ACID tables what Hive
pushed down as projection is already a list of column indices within the row
struct. So within this row struct for the first level columns, it should work.
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