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Finds rows that have valid values (ettValueIsValid) in columns.
Examples:
ettGridFindValidRows(grid) // checks all columns in all rows ettGridFindValidRows(grid, "v0") // checks v0 in all rows ettGridFindValidRows(grid, ["v0", "v2"]) // checks v0 and v2 in all rows
Check if value is valid (not null, not NA, not NaN).
Examples:
ettValueIsValid(true) >> true ettValueIsValid(123) >> true ettValueIsValid(null) >> false ettValueIsValid(na()) >> false ettValueIsValid(nan()) >> false