add pyspark compile rule for greatest, fix bug with selection #4
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icexelloss
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This is a Pyspark backend for ibis. This is different from the spark backend where the ibis expr is compiled to SQL string. Instead, the pyspark backend compiles the ibis expr to pyspark.DataFrame exprs. Author: Li Jin <ice.xelloss@gmail.com> Author: Hyonjee Joo <5000208+hjoo@users.noreply.github.com> Closes ibis-project#1913 from icexelloss/pyspark-backend-prototype and squashes the following commits: 213e371 [Li Jin] Add pyspark/__init__.py 8f1c35e [Li Jin] Address comments f173425 [Li Jin] Fix tests 0969b0a [Li Jin] Skip unimplemented tests 1f9409b [Li Jin] Change pyspark imports to optional 26b041c [Li Jin] Add importskip 108ccd8 [Li Jin] Add scope e00dc00 [Li Jin] Address PR comments 4764a4e [Li Jin] Add pyspark marker to setup.cfg 7cc2a9e [Li Jin] Remove dead code 72b45f8 [Li Jin] Fix rebase errors 9ad663f [Hyonjee Joo] implement pyspark numeric operations to pass all/test_numeric.py (#9) 675a89f [Li Jin] Implement compiler rules to pass all/test_aggregation.py 215c0d9 [Li Jin] Link existing tests with PySpark backend (#7) 88705fe [Li Jin] Implement basic join c4a2b79 [Hyonjee Joo] add pyspark compile rule for greatest, fix bug with selection (#4) fa4ad23 [Li Jin] Implement basic aggregation, group_by and window (#3) 54c2f2d [Li Jin] Initial commit of pyspark DataFrame backend (#1)
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