Examples with RowCursor com.questdb.common.RowCursor used on opensource projects

Example 11 with RowCursor

use of com.questdb.common.RowCursor in project questdb by bluestreak01.

the class IntervalFrameCursorTest method assertIndexRowsMatchSymbol.

private static void assertIndexRowsMatchSymbol(DataFrameCursor cursor, TableReaderRecord record, int columnIndex, long expectedCount) {
    // SymbolTable is table at table scope, so it will be the same for every
    // data frame here. Get its instance outside of data frame loop.
    SymbolTable symbolTable = cursor.getSymbolTable(columnIndex);
    long rowCount = 0;
    while (cursor.hasNext()) {
        DataFrame frame = cursor.next();
        record.jumpTo(frame.getPartitionIndex(), frame.getRowLo());
        final long limit = frame.getRowHi();
        final long low = frame.getRowLo();
        // BitmapIndex is always at data frame scope, each table can have more than one.
        // we have to get BitmapIndexReader instance once for each frame.
        BitmapIndexReader indexReader = frame.getBitmapIndexReader(columnIndex);
        // because out Symbol column 0 is indexed, frame has to have index.
        Assert.assertNotNull(indexReader);
        int keyCount = indexReader.getKeyCount();
        for (int i = 0; i < keyCount; i++) {
            RowCursor ic = indexReader.getCursor(i, limit - 1);
            CharSequence expected = symbolTable.value(i - 1);
            while (ic.hasNext()) {
                long row = ic.next();
                if (row < low) {
                    break;
                }
                record.setRecordIndex(row);
                TestUtils.assertEquals(expected, record.getSym(columnIndex));
                rowCount++;
            }
        }
    }
    Assert.assertEquals(expectedCount, rowCount);
}

Example 12 with RowCursor

use of com.questdb.common.RowCursor in project questdb by bluestreak01.

the class HeapMergingRowSource method prepareCursor.

@Override
public RowCursor prepareCursor(PartitionSlice slice) {
    heap.clear();
    for (int i = 0, n = sources.length; i < n; i++) {
        RowCursor c = Unsafe.arrayGet(sources, i).prepareCursor(slice);
        Unsafe.arrayPut(cursors, i, c);
        if (c.hasNext()) {
            heap.add(i, c.next());
        }
    }
    return this;
}

Example 13 with RowCursor

use of com.questdb.common.RowCursor in project questdb by bluestreak01.

the class HeapRowCursor method of.

public void of(RowCursor[] cursors) {
    assert nCursors == cursors.length;
    this.cursors = cursors;
    this.heap.clear();
    for (int i = 0; i < nCursors; i++) {
        RowCursor cursor = Unsafe.arrayGet(cursors, i);
        if (cursor.hasNext()) {
            heap.add(i, cursor.next());
        }
    }
}