parse "<table>" default format is "json" "<table>:<format>" format "json", "csv" "<table>:<format>:<compress>" transformer "gzip" or "-", "" for no-compression.

SetDefaultValue set default values for the struct field.

///////////////// utilities.

StrPad returns the input string padded on the left, right or both sides using padType to the specified padding length padLength.

ToTime converts to time.Time ex) "now" converts into current time, ex) "now + 1s", "now - 1h".