Examples with MAX_BATCH_SIZE io.prestosql.orc.OrcReader.MAX_BATCH_SIZE used on opensource projects

Example 1 with MAX_BATCH_SIZE

use of io.prestosql.orc.OrcReader.MAX_BATCH_SIZE in project hetu-core by openlookeng.

the class TestOrcReaderPositions method testRowGroupSkipping.

@Test
public void testRowGroupSkipping() throws Exception {
    try (TempFile tempFile = new TempFile()) {
        // create single strip file with multiple row groups
        int rowCount = 142_000;
        createSequentialFile(tempFile.getFile(), rowCount);
        // test reading two row groups from middle of file
        OrcPredicate predicate = (numberOfRows, allColumnStatistics) -> {
            if (numberOfRows == rowCount) {
                return true;
            }
            IntegerStatistics stats = allColumnStatistics.get(new OrcColumnId(1)).getIntegerStatistics();
            return (stats.getMin() == 50_000) || (stats.getMin() == 60_000);
        };
        try (OrcRecordReader reader = createCustomOrcRecordReader(tempFile, predicate, BIGINT, MAX_BATCH_SIZE)) {
            assertEquals(reader.getFileRowCount(), rowCount);
            assertEquals(reader.getReaderRowCount(), rowCount);
            assertEquals(reader.getFilePosition(), 0);
            assertEquals(reader.getReaderPosition(), 0);
            long position = 50_000;
            while (true) {
                Page page = reader.nextPage();
                if (page == null) {
                    break;
                }
                page = page.getLoadedPage();
                Block block = page.getBlock(0);
                for (int i = 0; i < block.getPositionCount(); i++) {
                    assertEquals(BIGINT.getLong(block, i), position + i);
                }
                assertEquals(reader.getFilePosition(), position);
                assertEquals(reader.getReaderPosition(), position);
                position += page.getPositionCount();
            }
            assertEquals(position, 70_000);
            assertEquals(reader.getFilePosition(), rowCount);
            assertEquals(reader.getReaderPosition(), rowCount);
        }
    }
}

Example 2 with MAX_BATCH_SIZE

use of io.prestosql.orc.OrcReader.MAX_BATCH_SIZE in project hetu-core by openlookeng.

the class TestOrcReaderPositions method testStripeSkipping.

@Test
public void testStripeSkipping() throws Exception {
    try (TempFile tempFile = new TempFile()) {
        createMultiStripeFile(tempFile.getFile());
        // test reading second and fourth stripes
        OrcPredicate predicate = (numberOfRows, allColumnStatistics) -> {
            if (numberOfRows == 100) {
                return true;
            }
            IntegerStatistics stats = allColumnStatistics.get(new OrcColumnId(1)).getIntegerStatistics();
            return ((stats.getMin() == 60) && (stats.getMax() == 117)) || ((stats.getMin() == 180) && (stats.getMax() == 237));
        };
        try (OrcRecordReader reader = createCustomOrcRecordReader(tempFile, predicate, BIGINT, MAX_BATCH_SIZE)) {
            assertEquals(reader.getFileRowCount(), 100);
            assertEquals(reader.getReaderRowCount(), 40);
            assertEquals(reader.getFilePosition(), 0);
            assertEquals(reader.getReaderPosition(), 0);
            // second stripe
            Page page = reader.nextPage().getLoadedPage();
            assertEquals(page.getPositionCount(), 20);
            assertEquals(reader.getReaderPosition(), 0);
            assertEquals(reader.getFilePosition(), 20);
            assertCurrentBatch(page, 1);
            // fourth stripe
            page = reader.nextPage().getLoadedPage();
            assertEquals(page.getPositionCount(), 20);
            assertEquals(reader.getReaderPosition(), 20);
            assertEquals(reader.getFilePosition(), 60);
            assertCurrentBatch(page, 3);
            page = reader.nextPage();
            assertNull(page);
            assertEquals(reader.getReaderPosition(), 40);
            assertEquals(reader.getFilePosition(), 100);
        }
    }
}