Github user hyunsik commented on a diff in the pull request:
https://github.com/apache/tajo/pull/601#discussion_r33110710
--- Diff: tajo-common/src/main/java/org/apache/tajo/SessionVars.java ---
@@ -126,6 +126,9 @@
NULL_CHAR(ConfVars.$TEXT_NULL, "null char of text file output", DEFAULT),
CODEGEN(ConfVars.$CODEGEN, "Runtime code generation enabled
(experiment)", DEFAULT),
+
TABLE_PARTITION_KEPT_EXISTING_DATA_ENABLED(ConfVars.$TABLE_PARTITION_KEPT_EXISTING_DATA_ENABLED,
+ "When inserting empty data into a partitioned table, set to keep
existing data.", DEFAULT),
--- End diff --
It would be better if the description is 'If True, a partitioned table is
overwritten even if a sub query leads to no result. Otherwise, the table data
will be kept if there is no result.'.
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