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Execution example::
column_copy FromTable from_column FromTable to_column
# [[0,1337566253.89858,0.000355720520019531],true]
select FromTable --output_columns _key,from_column,to_column
# [
# [
# 0,
# 1337566253.89858,
# 0.000355720520019531
# ],
# [
# [
# [
# 1
# ],
# [
# [
# "_key",
# "ShortText"
# ],
# [
# "from_column",
# "ShortText"
# ],
# [
# "to_column",
# "ShortText"
# ]
# ],
# [
# "key1",
# "value1",
# "value1"
# ]
# ]
# ]
# ]
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