Github user sounakr commented on the issue:
https://github.com/apache/incubator-carbondata/pull/723
@ravipesala Insert Select from same table is allowed both in Hive and
Parquet. Spark-5746 introduced this behavior as they are deleting the source
table data first before inserting when overwrite is turned ON. But for carbon
insert select Overwrite is always false and as other data sources are allowing
insert select into same table it is good to have. Also the below kind of
queries will help to load data.
insert into tab1 sel a *4, b*4 from tab1;
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