Github user daveoshinsky commented on the issue:
https://github.com/apache/drill/pull/570
The initial set of check-ins as of 8/16/2016 demonstrates use of a new
one-size-fits-all VARDECIMAL type, initially only to support variable width
BINARY decimal columns from Parquet files (see DRILL-4184). For now, the new
VARDECIMAL type exists alongside all of the other decimal types. If this
change looks good, we can eventually clean up the decimal logic by deprecating
all of the other (fixed width) decimal types, and use VARDECIMAL only. The
Cast behavior may be somewhat strange at present (it was seen to cast from an
int to VARDECIMAL via FLOAT8). A unit test with some test data is included.
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