Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/3501#issuecomment-65336693
Hive seems only ignore the lines start with "--" when reading SQL script
from stream / file.
https://github.com/apache/hive/blob/branch-0.13/cli/src/java/org/apache/hadoop/hive/cli/CliDriver.java#L445
It still be nice if we support more powerful comment filtering, the concern
is maintain the code seems not that easy, for example, what about if query like:
```
SELECT key, value FROM src where value like "_--##";
```
Build an escaping probably make thing more complicated.
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