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[oracle] Always check bounding box intersection when using filter rect
Because oracle sdo_filter sometimes returns results outside the given filter (depending on the spatial index), and is only designed for use as a fast "first-pass" filter. From the Oracle docs: "This operator performs only a primary filter operation.. The secondary filtering operation, performed by the SDO_RELATE operator, can be used to determine with certainty if objects interact spatially." Instead of using SDO_RELATE we can instead just do a bounding box intersection inside QGIS if an exact intersection is not required. Fixes failing provider conformance test suite for oracle provider.
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