When `exists` was used in conjunction with any other pushed down
expression, the `exists` was not rewritten properly because the rewrite
did not descend into logical expressions.
This is now fixed so those expressions will be rewritten correctly. This
affected the following form:
filter(fn: (r) => r._measurement == "cpu" and exists r.host)
It did not affect the following:
filter(fn: (r) => r._measurement == "cpu")
|> filter(fn: (r) => exists r.host)
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| .. | ||
| experimental | ||
| influxdata/influxdb | ||
| testing | ||
| packages.go | ||