Github user hsuanyi commented on a diff in the pull request:
https://github.com/apache/drill/pull/262#discussion_r45092551
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/impl/conv/DateEpochBEConvertFrom.java
---
@@ -41,6 +41,7 @@ public void eval() {
in.buffer.readerIndex(in.start);
long epochMillis = Long.reverseBytes(in.buffer.readLong());
+ in.buffer.readerIndex(0);
--- End diff --
Imagine this case:
A downstream operator asks Project for producing two columns,
convert_to(col, ...) and col.
Due to the current implementation of convert_to(), after the the
convert_to(col, ...) evaluation is done, the readIndex in col's Drillbuf will
be pointed at the end.
Then after the receiver uses RecordBatchLoader to read this Drillbuf, IOOB
will be thrown
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