Expression does not evaluate to boolean: got T_NULL

[dubreuia]

Here's a minimal csv test file (named "miller_test.csv"):

"header1","header2"
"value1","value2"

I'm trying to filter on empty header1 column with:

mlr --csv filter '$header1 != ""' miller_test.csv

And I get:

Expression does not evaluate to boolean: got T_NULL.
*** Error in `mlr': munmap_chunk(): invalid pointer: 0x000000000042915d ***
Aborted (core dumped)

I have a fresh master from 5 minutes ago, freshly compiled, on gnome ubuntu 15.04.

[johnkerl]

Part of this is double-quoting: #4

For that reason, header1 is named "header1" and isn't appearing. So the second issue (after double-quoting) is filter on non-present fields, which violates Miller's fundamental heterogeneity-tolerance feature (http://johnkerl.org/miller/doc/record-heterogeneity.html).

[johnkerl]

Second issue fixed on commit 624841f

First is underway ;)

Thanks for the bug report!!

[dubreuia]

No problem, thanks for developing miller!