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Fix validation of column names for variadic input #36

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@tkilias

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@tkilias

Background

  • Variadic Input UDF use number of the column names
  • They start counting at 0, which fits also to the use of getitem
--/
CREATE OR REPLACE PYTHON SCALAR SCRIPT test_variadic (...) EMITS (o VARCHAR(2000000)) AS
def run(ctx):
  ctx.emit(str([column.name for column in exa.meta.input_columns]))
/


select test_variadic('a1','a2','a3','a4','a5');

[u'0', u'1', u'2', u'3', u'4']

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