Examples with PrestoWarning com.facebook.presto.spi.PrestoWarning used on opensource projects

Example 6 with PrestoWarning

use of com.facebook.presto.spi.PrestoWarning in project presto by prestodb.

the class TestAnalyzer method testUnionDistinctPerformanceWarning.

@Test
public void testUnionDistinctPerformanceWarning() {
    WarningCollector warningCollector = analyzeWithWarnings("SELECT a,b,c,d FROM t8 UNION DISTINCT SELECT a,b,c,d FROM t9");
    List<PrestoWarning> warnings = warningCollector.getWarnings();
    assertEquals(warnings.size(), 1);
    // Ensure warning is the performance warning we expect
    PrestoWarning warning = warnings.get(0);
    assertEquals(warning.getWarningCode(), PERFORMANCE_WARNING.toWarningCode());
    assertTrue(warning.getMessage().startsWith("UNION DISTINCT"));
}

Example 7 with PrestoWarning

use of com.facebook.presto.spi.PrestoWarning in project presto by prestodb.

the class TestAnalyzer method testCountDistinctPerformanceWarning.

@Test
public void testCountDistinctPerformanceWarning() {
    WarningCollector warningCollector = analyzeWithWarnings("SELECT COUNT(DISTINCT a) FROM t1 GROUP BY b");
    List<PrestoWarning> warnings = warningCollector.getWarnings();
    assertEquals(warnings.size(), 1);
    // Ensure warning is the performance warning we expect
    PrestoWarning warning = warnings.get(0);
    assertEquals(warning.getWarningCode(), PERFORMANCE_WARNING.toWarningCode());
    assertTrue(warning.getMessage().contains("COUNT(DISTINCT xxx)"));
}

Example 8 with PrestoWarning

use of com.facebook.presto.spi.PrestoWarning in project presto by prestodb.

the class WarnOnScanWithoutPartitionPredicate method validate.

@Override
public void validate(PlanNode plan, Session session, Metadata metadata, SqlParser sqlParser, TypeProvider types, WarningCollector warningCollector) {
    for (TableScanNode scan : searchFrom(plan).where(TableScanNode.class::isInstance).<TableScanNode>findAll()) {
        TableHandle tableHandle = scan.getTable();
        TableLayoutFilterCoverage partitioningFilterCoverage = metadata.getTableLayoutFilterCoverage(session, tableHandle, warnOnNoTableLayoutFilter);
        if (partitioningFilterCoverage == NOT_COVERED) {
            String warningMessage = String.format("No partition filter for scan of table %s", scan.getTable().getConnectorHandle());
            warningCollector.add(new PrestoWarning(PERFORMANCE_WARNING, warningMessage));
        }
    }
}

Example 9 with PrestoWarning

use of com.facebook.presto.spi.PrestoWarning in project presto by prestodb.

the class KeyBasedSampler method optimize.

@Override
public PlanNode optimize(PlanNode plan, Session session, TypeProvider types, PlanVariableAllocator variableAllocator, PlanNodeIdAllocator idAllocator, WarningCollector warningCollector) {
    if (isKeyBasedSamplingEnabled(session)) {
        List<String> sampledFields = new ArrayList<>(2);
        PlanNode rewritten = SimplePlanRewriter.rewriteWith(new Rewriter(session, metadata.getFunctionAndTypeManager(), idAllocator, sampledFields), plan, null);
        if (!sampledFields.isEmpty()) {
            warningCollector.add(new PrestoWarning(SAMPLED_FIELDS, String.format("Sampled the following columns/derived columns at %s percent:\n\t%s", getKeyBasedSamplingPercentage(session) * 100., String.join("\n\t", sampledFields))));
        } else {
            warningCollector.add(new PrestoWarning(SEMANTIC_WARNING, "Sampling could not be performed due to the query structure"));
        }
        return rewritten;
    }
    return plan;
}

Example 10 with PrestoWarning

use of com.facebook.presto.spi.PrestoWarning in project presto by prestodb.

the class TestPlannerWarnings method createTestWarnings.

public static List<PrestoWarning> createTestWarnings(int numberOfWarnings) {
    checkArgument(numberOfWarnings > 0, "numberOfWarnings must be > 0");
    ImmutableList.Builder<PrestoWarning> builder = ImmutableList.builder();
    range(1, numberOfWarnings).mapToObj(code -> new PrestoWarning(new WarningCode(code, "testWarning"), "Test warning " + code)).forEach(builder::add);
    return builder.build();
}