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Last tested: Jan 21, 2019
In the visualization menu, open the X or Y axis menu and in the field labeled <X/Y> format options, use the commas to truncate the value and use literal strings to notate magnitude.
Each comma denotes three zeroes that will be omitted from the number.
Use: 0,, "Mil"
to turn "2,000,000" into "2 Mil"
and 0, "k"
to turn "2,000,000" into "2,000 k"
You can also use this in LookML using value_format. You'll need to escape the quotes, though, since you have to put the value format string in quotes.value_format: "0,, \"Mil\""
You can take advantage of conditional value formats to show differing symbols based on magnitude:[>=1000000]0.00,,\"M\";[>=1000]0.00,\"K\";0
This is documented in Help Center
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