clickhouse-grafana
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Extrapolation applies not only to the numerical data.
Extrapolation can be applied to strings, and we can get NaNs in the latest raw. There no NaN in actual data and NaN exists only if extrapolation turned on.
Tried with other data types, extrapolation for other non-numerical types returns NaN, for Null returns 0
actually if you have non-numeric data it shall be series name need more discuss in the next meeting