huaxingao commented on code in PR #10149:
URL: https://github.com/apache/iceberg/pull/10149#discussion_r1597722756
##########
spark/v3.5/spark/src/test/java/org/apache/iceberg/spark/data/TestSparkParquetWriter.java:
##########
@@ -116,4 +128,27 @@ public void testCorrectness() throws IOException {
assertThat(rows).as("Should not have extra rows").isExhausted();
}
}
+
+ @Test
+ public void testFpp() throws IOException, NoSuchFieldException,
IllegalAccessException {
+ File testFile = File.createTempFile("junit", null, temp.toFile());
+ try (FileAppender<InternalRow> writer =
+ Parquet.write(Files.localOutput(testFile))
+ .schema(SCHEMA)
+ .set(PARQUET_BLOOM_FILTER_COLUMN_ENABLED_PREFIX + "id", "true")
+ .set(PARQUET_BLOOM_FILTER_COLUMN_FPP_PREFIX + "id", "0.05")
+ .createWriterFunc(
+ msgType ->
+
SparkParquetWriters.buildWriter(SparkSchemaUtil.convert(SCHEMA), msgType))
+ .build()) {
+ // Using reflection to access the private 'props' field in ParquetWriter
+ Field propsField = writer.getClass().getDeclaredField("props");
+ propsField.setAccessible(true);
+ ParquetProperties props = (ParquetProperties) propsField.get(writer);
+ MessageType parquetSchema = ParquetSchemaUtil.convert(SCHEMA, "test");
+ ColumnDescriptor descriptor = parquetSchema.getColumnDescription(new
String[] {"id"});
+ double fpp = props.getBloomFilterFPP(descriptor).getAsDouble();
+ assertThat(fpp).isEqualTo(0.05);
Review Comment:
parquet-mr takes the `bloomFilterFPPs` in `ParquetProperties` and uses it to
build the bloom filter. Checking `bloomFilterFPPs` in `ParquetProperties` is
sufficient for verifying bloom filter fpp is set correctly in Iceberg.
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