API, Core: Make TestInclusiveMetricsEvaluator/TestInclusiveMetricsEvaluatorWithExtract/TestInclusiveMetricsEvaluatorWithTransforms extendable - #17430
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The single_value_nulls fixtures in testNotEqWithSingleValue and testNotInWithSingleValue reported 2 nulls for field 3, the "required" column. A required column cannot contain nulls, so no writer produces those metrics. Move both to the optional "some_empty" column, which keeps the case the tests cover: a file whose bounds hold a single value still has to be read when the column also contains nulls, because those nulls match != and NOT IN. The NOT IN fixture also reported a NaN count for a string column, which only float and double columns track.
The range_of_values and single_value fixtures reported a NaN count for field 3, a string column. Only float and double columns track NaN counts, which is why the single_value fixture in testNotEqWithSingleValue already passed null for them. Generated-by: Cursor
`FILE_6` in `TestInclusiveMetricsEvaluator` carried value and null counts for the
`required_address` and `optional_address` structs. Parquet produces metrics for leaf
columns only in `ParquetMetrics.MetricsVisitor.struct` and returns just the concatenation of
its children and never emits a `FieldMetrics` for the struct — so no Parquet file yields
those entries. They made `notNull("optional_address")` appear prunable when in practice it is not
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This makes the three test classes extendible so that we can introduce separate test classes that use a content stats evaluator but run through the same set of tests
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