Hi,
I have list of columns as an array, for example:
columns = [ :level1, :level2, :level3]
I would like to select only those columns. How can I do that?
Following code does not seem to work as expected:
result = dataset.select(columns)
this wraps column names in parenthesis:
SELECT (level1, level2, level3) FROM ...
which results in SQL syntax error.
Thanks,
Stefan
p.s.: Side-question: is this a bug or a feature, that selection using
Hash has keys as "what is going to be selected" and values as column
names? I would expect logically something like this:
selection = Hash.new
selection[:column_name] = "expression"
dataset.select(selection)
instead of current implementation:
selection = Hash.new
selection["expression"] = :column_name
dataset.select(selection)
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