Examples with RowFilter org.apache.hadoop.hbase.filter.RowFilter used on opensource projects

Example 36 with RowFilter

use of org.apache.hadoop.hbase.filter.RowFilter in project hbase by apache.

the class MetaTableAccessor method scanByRegionEncodedName.

/**
 * Scans META table for a row whose key contains the specified <B>regionEncodedName</B>, returning
 * a single related <code>Result</code> instance if any row is found, null otherwise.
 * @param connection the connection to query META table.
 * @param regionEncodedName the region encoded name to look for at META.
 * @return <code>Result</code> instance with the row related info in META, null otherwise.
 * @throws IOException if any errors occur while querying META.
 */
public static Result scanByRegionEncodedName(Connection connection, String regionEncodedName) throws IOException {
    RowFilter rowFilter = new RowFilter(CompareOperator.EQUAL, new SubstringComparator(regionEncodedName));
    Scan scan = getMetaScan(connection.getConfiguration(), 1);
    scan.setFilter(rowFilter);
    try (Table table = getMetaHTable(connection);
        ResultScanner resultScanner = table.getScanner(scan)) {
        return resultScanner.next();
    }
}

Example 37 with RowFilter

use of org.apache.hadoop.hbase.filter.RowFilter in project hbase by apache.

the class TestRegionServerReadRequestMetrics method testReadRequestsCountWithFilter.

// HBASE-19785
@Ignore
@Test
public void testReadRequestsCountWithFilter() throws Exception {
    int resultCount;
    Scan scan;
    // test for scan
    scan = new Scan();
    scan.setFilter(new SingleColumnValueFilter(CF1, COL1, CompareOperator.EQUAL, VAL1));
    try (ResultScanner scanner = table.getScanner(scan)) {
        resultCount = 0;
        for (Result ignore : scanner) {
            resultCount++;
        }
        testReadRequests(resultCount, 2, 1);
    }
    // test for scan
    scan = new Scan();
    scan.setFilter(new RowFilter(CompareOperator.EQUAL, new BinaryComparator(ROW1)));
    try (ResultScanner scanner = table.getScanner(scan)) {
        resultCount = 0;
        for (Result ignore : scanner) {
            resultCount++;
        }
        testReadRequests(resultCount, 1, 2);
    }
    // test for scan
    scan = new Scan().withStartRow(ROW2).withStopRow(ROW3);
    scan.setFilter(new RowFilter(CompareOperator.EQUAL, new BinaryComparator(ROW1)));
    try (ResultScanner scanner = table.getScanner(scan)) {
        resultCount = 0;
        for (Result ignore : scanner) {
            resultCount++;
        }
        testReadRequests(resultCount, 0, 1);
    }
// fixme filtered get should not increase readRequestsCount
// Get get = new Get(ROW2);
// get.setFilter(new SingleColumnValueFilter(CF1, COL1, CompareFilter.CompareOp.EQUAL, VAL1));
// Result result = table.get(get);
// resultCount = result.isEmpty() ? 0 : 1;
// testReadRequests(resultCount, 0, 1);
}

Example 38 with RowFilter

use of org.apache.hadoop.hbase.filter.RowFilter in project drill by apache.

the class MapRDBFilterBuilder method createHBaseScanSpec.

private HBaseScanSpec createHBaseScanSpec(FunctionCall call, MaprDBCompareFunctionsProcessor processor) {
    String functionName = processor.getFunctionName();
    SchemaPath field = processor.getPath();
    byte[] fieldValue = processor.getValue();
    boolean sortOrderAscending = processor.isSortOrderAscending();
    boolean isRowKey = field.getRootSegmentPath().equals(ROW_KEY);
    if (!(isRowKey || (!field.getRootSegment().isLastPath() && field.getRootSegment().getChild().isLastPath() && field.getRootSegment().getChild().isNamed()))) {
        /*
       * if the field in this function is neither the row_key nor a qualified HBase column, return.
       */
        return null;
    }
    if (processor.isRowKeyPrefixComparison()) {
        return createRowKeyPrefixScanSpec(call, processor);
    }
    CompareOp compareOp = null;
    boolean isNullTest = false;
    ByteArrayComparable comparator = new BinaryComparator(fieldValue);
    byte[] startRow = HConstants.EMPTY_START_ROW;
    byte[] stopRow = HConstants.EMPTY_END_ROW;
    switch(functionName) {
        case FunctionNames.EQ:
            compareOp = CompareOp.EQUAL;
            if (isRowKey) {
                startRow = fieldValue;
                /* stopRow should be just greater than 'value'*/
                stopRow = Arrays.copyOf(fieldValue, fieldValue.length + 1);
                compareOp = CompareOp.EQUAL;
            }
            break;
        case FunctionNames.NE:
            compareOp = CompareOp.NOT_EQUAL;
            break;
        case FunctionNames.GE:
            if (sortOrderAscending) {
                compareOp = CompareOp.GREATER_OR_EQUAL;
                if (isRowKey) {
                    startRow = fieldValue;
                }
            } else {
                compareOp = CompareOp.LESS_OR_EQUAL;
                if (isRowKey) {
                    // stopRow should be just greater than 'value'
                    stopRow = Arrays.copyOf(fieldValue, fieldValue.length + 1);
                }
            }
            break;
        case FunctionNames.GT:
            if (sortOrderAscending) {
                compareOp = CompareOp.GREATER;
                if (isRowKey) {
                    // startRow should be just greater than 'value'
                    startRow = Arrays.copyOf(fieldValue, fieldValue.length + 1);
                }
            } else {
                compareOp = CompareOp.LESS;
                if (isRowKey) {
                    stopRow = fieldValue;
                }
            }
            break;
        case FunctionNames.LE:
            if (sortOrderAscending) {
                compareOp = CompareOp.LESS_OR_EQUAL;
                if (isRowKey) {
                    // stopRow should be just greater than 'value'
                    stopRow = Arrays.copyOf(fieldValue, fieldValue.length + 1);
                }
            } else {
                compareOp = CompareOp.GREATER_OR_EQUAL;
                if (isRowKey) {
                    startRow = fieldValue;
                }
            }
            break;
        case FunctionNames.LT:
            if (sortOrderAscending) {
                compareOp = CompareOp.LESS;
                if (isRowKey) {
                    stopRow = fieldValue;
                }
            } else {
                compareOp = CompareOp.GREATER;
                if (isRowKey) {
                    // startRow should be just greater than 'value'
                    startRow = Arrays.copyOf(fieldValue, fieldValue.length + 1);
                }
            }
            break;
        case FunctionNames.IS_NULL:
        case "isNull":
        case "is null":
            if (isRowKey) {
                return null;
            }
            isNullTest = true;
            compareOp = CompareOp.EQUAL;
            comparator = new NullComparator();
            break;
        case FunctionNames.IS_NOT_NULL:
        case "isNotNull":
        case "is not null":
            if (isRowKey) {
                return null;
            }
            compareOp = CompareOp.NOT_EQUAL;
            comparator = new NullComparator();
            break;
        case "like":
            /*
       * Convert the LIKE operand to Regular Expression pattern so that we can
       * apply RegexStringComparator()
       */
            HBaseRegexParser parser = new HBaseRegexParser(call).parse();
            compareOp = CompareOp.EQUAL;
            comparator = new RegexStringComparator(parser.getRegexString());
            /*
       * We can possibly do better if the LIKE operator is on the row_key
       */
            if (isRowKey) {
                String prefix = parser.getPrefixString();
                if (prefix != null) {
                    /*
           * If there is a literal prefix, it can help us prune the scan to a sub range
           */
                    if (prefix.equals(parser.getLikeString())) {
                        /* The operand value is literal. This turns the LIKE operator to EQUAL operator */
                        startRow = stopRow = fieldValue;
                        compareOp = null;
                    } else {
                        startRow = prefix.getBytes(Charsets.UTF_8);
                        stopRow = startRow.clone();
                        boolean isMaxVal = true;
                        for (int i = stopRow.length - 1; i >= 0; --i) {
                            int nextByteValue = (0xff & stopRow[i]) + 1;
                            if (nextByteValue < 0xff) {
                                stopRow[i] = (byte) nextByteValue;
                                isMaxVal = false;
                                break;
                            } else {
                                stopRow[i] = 0;
                            }
                        }
                        if (isMaxVal) {
                            stopRow = HConstants.EMPTY_END_ROW;
                        }
                    }
                }
            }
            break;
    }
    if (compareOp != null || startRow != HConstants.EMPTY_START_ROW || stopRow != HConstants.EMPTY_END_ROW) {
        Filter filter = null;
        if (isRowKey) {
            if (compareOp != null) {
                filter = new RowFilter(compareOp, comparator);
            }
        } else {
            byte[] family = HBaseUtils.getBytes(field.getRootSegment().getPath());
            byte[] qualifier = HBaseUtils.getBytes(field.getRootSegment().getChild().getNameSegment().getPath());
            filter = new SingleColumnValueFilter(family, qualifier, compareOp, comparator);
            ((SingleColumnValueFilter) filter).setLatestVersionOnly(true);
            if (!isNullTest) {
                ((SingleColumnValueFilter) filter).setFilterIfMissing(true);
            }
        }
        return new HBaseScanSpec(groupScan.getTableName(), startRow, stopRow, filter);
    }
    // else
    return null;
}

Example 39 with RowFilter

use of org.apache.hadoop.hbase.filter.RowFilter in project beam by apache.

the class HBaseIOTest method testReadingWithFilterSDF.

@Test
public void testReadingWithFilterSDF() throws Exception {
    final String table = tmpTable.getName();
    final int numRows = 1001;
    createAndWriteData(table, numRows);
    String regex = ".*17.*";
    Filter filter = new RowFilter(CompareFilter.CompareOp.EQUAL, new RegexStringComparator(regex));
    runReadTestLength(HBaseIO.read().withConfiguration(conf).withTableId(table).withFilter(filter), true, 20);
}