Examples with VarCharColumnWriter org.apache.drill.exec.vector.accessor.ColumnAccessors.VarCharColumnWriter used on opensource projects

Example 11 with VarCharColumnWriter

use of org.apache.drill.exec.vector.accessor.ColumnAccessors.VarCharColumnWriter in project drill by apache.

the class TestVariableWidthWriter method makeWriter.

private VarCharColumnWriter makeWriter(VarCharVector vector, TestIndex index) {
    VarCharColumnWriter writer = new VarCharColumnWriter(vector);
    writer.bindIndex(index);
    assertEquals(ValueType.STRING, writer.valueType());
    return writer;
}

Example 12 with VarCharColumnWriter

use of org.apache.drill.exec.vector.accessor.ColumnAccessors.VarCharColumnWriter in project drill by apache.

the class TestVariableWidthWriter method testRollover.

/**
 * The rollover method is used during vector overflow.
 */
@Test
public void testRollover() {
    try (VarCharVector vector = allocVector(1000)) {
        TestIndex index = new TestIndex();
        VarCharColumnWriter writer = makeWriter(vector, index);
        writer.startWrite();
        // Simulate doing an overflow of ten values.
        String base = "sample-value";
        for (int i = 0; i < 10; i++) {
            index.index = i;
            writer.startRow();
            writer.setString(base + i);
            writer.saveRow();
        }
        // Overflow occurs after writing the 11th row
        index.index = 10;
        writer.startRow();
        String overflowValue = base + 10;
        writer.setString(overflowValue);
        // Overflow occurs
        writer.preRollover();
        // Simulate rollover
        byte[] dummy = new byte[] { (byte) 0x55 };
        for (int i = 0; i < 500; i++) {
            vector.getMutator().setSafe(i, dummy);
        }
        for (int i = 1; i < 15; i++) {
            vector.getOffsetVector().getMutator().set(i, 0xdeadbeef);
        }
        vector.getMutator().setSafe(0, overflowValue.getBytes(Charsets.UTF_8));
        writer.postRollover();
        index.index = 0;
        writer.saveRow();
        for (int i = 1; i < 5; i++) {
            index.index = i;
            writer.startRow();
            writer.setString(base + (i + 10));
            writer.saveRow();
        }
        writer.endWrite();
        for (int i = 0; i < 5; i++) {
            assertEquals(base + (10 + i), stringAt(vector, i));
        }
    }
}

Example 13 with VarCharColumnWriter

use of org.apache.drill.exec.vector.accessor.ColumnAccessors.VarCharColumnWriter in project drill by apache.

the class TestVariableWidthWriter method testSizeLimit.

/**
 * Test resize monitoring. Add a listener to an Varchar writer,
 * capture each resize, and refuse a resize when the s
 * of the vector exceeds 1 MB. This will trigger an overflow,
 * which will throw an exception which we then check for.
 */
@Test
public void testSizeLimit() {
    try (VarCharVector vector = allocVector(1000)) {
        TestIndex index = new TestIndex();
        VarCharColumnWriter writer = makeWriter(vector, index);
        writer.bindListener(new ColumnWriterListener() {

            // Because assumed array size is 10, so 10 * 1000 = 10,000
            // rounded to 16K
            int totalAlloc = 16384;

            @Override
            public void overflowed(ScalarWriter writer) {
                throw new IllegalStateException("overflow called");
            }

            @Override
            public boolean canExpand(ScalarWriter writer, int delta) {
                totalAlloc += delta;
                return totalAlloc < 1024 * 1024;
            }
        });
        writer.startWrite();
        byte[] value = new byte[423];
        Arrays.fill(value, (byte) 'X');
        try {
            for (int i = 0; ; i++) {
                index.index = i;
                writer.startRow();
                writer.setBytes(value, value.length);
                writer.saveRow();
            }
        } catch (IllegalStateException e) {
            assertTrue(e.getMessage().contains("overflow called"));
        }
    }
}

Example 14 with VarCharColumnWriter

use of org.apache.drill.exec.vector.accessor.ColumnAccessors.VarCharColumnWriter in project drill by apache.

the class TestVariableWidthWriter method testRolloverWithEmpties.

/**
 * Simulate the case in which the tail end of an overflow
 * batch has empties. <tt>preRollover()</tt> should back-fill
 * them with the next offset prior to rollover.
 */
@Test
public void testRolloverWithEmpties() {
    try (VarCharVector vector = allocVector(1000)) {
        TestIndex index = new TestIndex();
        VarCharColumnWriter writer = makeWriter(vector, index);
        writer.startWrite();
        // Simulate doing an overflow of 15 values,
        // of which 5 are empty.
        String base = "sample-value";
        for (int i = 0; i < 10; i++) {
            index.index = i;
            writer.startRow();
            writer.setString(base + i);
            writer.saveRow();
        }
        for (int i = 10; i < 15; i++) {
            index.index = i;
            writer.startRow();
            writer.saveRow();
        }
        // Overflow occurs before writing the 16th row
        index.index = 15;
        writer.startRow();
        // Overflow occurs. This should fill empty offsets.
        writer.preRollover();
        for (int i = 0; i < 10; i++) {
            assertEquals(base + i, stringAt(vector, i));
        }
        for (int i = 10; i < 15; i++) {
            assertEquals("", stringAt(vector, i));
        }
        // Simulate rollover
        byte[] dummy = new byte[] { (byte) 0x55 };
        for (int i = 0; i < 500; i++) {
            vector.getMutator().setSafe(i, dummy);
        }
        for (int i = 1; i < 15; i++) {
            vector.getOffsetVector().getMutator().set(i, 0xdeadbeef);
        }
        vector.getMutator().setSafe(0, new byte[] {});
        writer.postRollover();
        index.index = 0;
        writer.saveRow();
        for (int i = 1; i < 5; i++) {
            index.index = i;
            writer.startRow();
            writer.saveRow();
        }
        for (int i = 5; i < 10; i++) {
            index.index = i;
            writer.startRow();
            writer.setString(base + (i + 20));
            writer.saveRow();
        }
        writer.endWrite();
        for (int i = 0; i < 5; i++) {
            assertEquals("", stringAt(vector, i));
        }
        for (int i = 5; i < 10; i++) {
            assertEquals(base + (i + 20), stringAt(vector, i));
        }
    }
}

Example 15 with VarCharColumnWriter

use of org.apache.drill.exec.vector.accessor.ColumnAccessors.VarCharColumnWriter in project drill by apache.

the class TestVariableWidthWriter method testFillEmpties.

/**
 * Filling empties in a variable-width row means carrying forward
 * offsets (as tested elsewhere), leaving zero-length values.
 */
@Test
public void testFillEmpties() {
    try (VarCharVector vector = allocVector(1000)) {
        TestIndex index = new TestIndex();
        VarCharColumnWriter writer = makeWriter(vector, index);
        writer.startWrite();
        // Write values, skipping four out of five positions,
        // forcing backfill.
        // The number of values is odd, forcing the writer to
        // back-fill at the end as well as between values.
        String base = "sample-value";
        for (int i = 0; i < 501; i += 5) {
            index.index = i;
            writer.startRow();
            writer.setString(base + i);
            writer.saveRow();
        }
        // At end, vector index defined to point one past the
        // last row. That is, the vector index gives the row count.
        index.index = 504;
        writer.endWrite();
        for (int i = 0; i < 504; i++) {
            assertEquals("Mismatch on " + i, (i % 5) == 0 ? base + i : "", stringAt(vector, i));
        }
    }
}