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Example 1 with FieldDereference

use of io.trino.spi.expression.FieldDereference in project trino by trinodb.

the class HiveApplyProjectionUtil method createProjectedColumnRepresentation.

public static ProjectedColumnRepresentation createProjectedColumnRepresentation(ConnectorExpression expression) {
    ImmutableList.Builder<Integer> ordinals = ImmutableList.builder();
    Variable target;
    while (true) {
        if (expression instanceof Variable) {
            target = (Variable) expression;
            break;
        } else if (expression instanceof FieldDereference) {
            FieldDereference dereference = (FieldDereference) expression;
            ordinals.add(dereference.getField());
            expression = dereference.getTarget();
        } else {
            throw new IllegalArgumentException("expression is not a valid dereference chain");
        }
    }
    return new ProjectedColumnRepresentation(target, ordinals.build().reverse());
}
Also used : FieldDereference(io.trino.spi.expression.FieldDereference) Variable(io.trino.spi.expression.Variable) ImmutableList(com.google.common.collect.ImmutableList)

Example 2 with FieldDereference

use of io.trino.spi.expression.FieldDereference in project trino by trinodb.

the class AbstractTestHive method testApplyProjection.

@Test
public void testApplyProjection() throws Exception {
    ColumnMetadata bigIntColumn0 = new ColumnMetadata("int0", BIGINT);
    ColumnMetadata bigIntColumn1 = new ColumnMetadata("int1", BIGINT);
    RowType oneLevelRowType = toRowType(ImmutableList.of(bigIntColumn0, bigIntColumn1));
    ColumnMetadata oneLevelRow0 = new ColumnMetadata("onelevelrow0", oneLevelRowType);
    RowType twoLevelRowType = toRowType(ImmutableList.of(oneLevelRow0, bigIntColumn0, bigIntColumn1));
    ColumnMetadata twoLevelRow0 = new ColumnMetadata("twolevelrow0", twoLevelRowType);
    List<ColumnMetadata> columnsForApplyProjectionTest = ImmutableList.of(bigIntColumn0, bigIntColumn1, oneLevelRow0, twoLevelRow0);
    SchemaTableName tableName = temporaryTable("apply_projection_tester");
    doCreateEmptyTable(tableName, ORC, columnsForApplyProjectionTest);
    try (Transaction transaction = newTransaction()) {
        ConnectorSession session = newSession();
        ConnectorMetadata metadata = transaction.getMetadata();
        ConnectorTableHandle tableHandle = getTableHandle(metadata, tableName);
        List<ColumnHandle> columnHandles = metadata.getColumnHandles(session, tableHandle).values().stream().filter(columnHandle -> !((HiveColumnHandle) columnHandle).isHidden()).collect(toList());
        assertEquals(columnHandles.size(), columnsForApplyProjectionTest.size());
        Map<String, ColumnHandle> columnHandleMap = columnHandles.stream().collect(toImmutableMap(handle -> ((HiveColumnHandle) handle).getBaseColumnName(), Function.identity()));
        // Emulate symbols coming from the query plan and map them to column handles
        Map<String, ColumnHandle> columnHandlesWithSymbols = ImmutableMap.of("symbol_0", columnHandleMap.get("int0"), "symbol_1", columnHandleMap.get("int1"), "symbol_2", columnHandleMap.get("onelevelrow0"), "symbol_3", columnHandleMap.get("twolevelrow0"));
        // Create variables for the emulated symbols
        Map<String, Variable> symbolVariableMapping = columnHandlesWithSymbols.entrySet().stream().collect(toImmutableMap(Map.Entry::getKey, e -> new Variable(e.getKey(), ((HiveColumnHandle) e.getValue()).getBaseType())));
        // Create dereference expressions for testing
        FieldDereference symbol2Field0 = new FieldDereference(BIGINT, symbolVariableMapping.get("symbol_2"), 0);
        FieldDereference symbol3Field0 = new FieldDereference(oneLevelRowType, symbolVariableMapping.get("symbol_3"), 0);
        FieldDereference symbol3Field0Field0 = new FieldDereference(BIGINT, symbol3Field0, 0);
        FieldDereference symbol3Field1 = new FieldDereference(BIGINT, symbolVariableMapping.get("symbol_3"), 1);
        Map<String, ColumnHandle> inputAssignments;
        List<ConnectorExpression> inputProjections;
        Optional<ProjectionApplicationResult<ConnectorTableHandle>> projectionResult;
        List<ConnectorExpression> expectedProjections;
        Map<String, Type> expectedAssignments;
        // Test projected columns pushdown to HiveTableHandle in case of all variable references
        inputAssignments = getColumnHandlesFor(columnHandlesWithSymbols, ImmutableList.of("symbol_0", "symbol_1"));
        inputProjections = ImmutableList.of(symbolVariableMapping.get("symbol_0"), symbolVariableMapping.get("symbol_1"));
        expectedAssignments = ImmutableMap.of("symbol_0", BIGINT, "symbol_1", BIGINT);
        projectionResult = metadata.applyProjection(session, tableHandle, inputProjections, inputAssignments);
        assertProjectionResult(projectionResult, false, inputProjections, expectedAssignments);
        // Empty result when projected column handles are same as those present in table handle
        projectionResult = metadata.applyProjection(session, projectionResult.get().getHandle(), inputProjections, inputAssignments);
        assertProjectionResult(projectionResult, true, ImmutableList.of(), ImmutableMap.of());
        // Extra columns handles in HiveTableHandle should get pruned
        projectionResult = metadata.applyProjection(session, ((HiveTableHandle) tableHandle).withProjectedColumns(ImmutableSet.copyOf(columnHandles)), inputProjections, inputAssignments);
        assertProjectionResult(projectionResult, false, inputProjections, expectedAssignments);
        // Test projection pushdown for dereferences
        inputAssignments = getColumnHandlesFor(columnHandlesWithSymbols, ImmutableList.of("symbol_2", "symbol_3"));
        inputProjections = ImmutableList.of(symbol2Field0, symbol3Field0Field0, symbol3Field1);
        expectedAssignments = ImmutableMap.of("onelevelrow0#f_int0", BIGINT, "twolevelrow0#f_onelevelrow0#f_int0", BIGINT, "twolevelrow0#f_int0", BIGINT);
        expectedProjections = ImmutableList.of(new Variable("onelevelrow0#f_int0", BIGINT), new Variable("twolevelrow0#f_onelevelrow0#f_int0", BIGINT), new Variable("twolevelrow0#f_int0", BIGINT));
        projectionResult = metadata.applyProjection(session, tableHandle, inputProjections, inputAssignments);
        assertProjectionResult(projectionResult, false, expectedProjections, expectedAssignments);
        // Test reuse of virtual column handles
        // Round-1: input projections [symbol_2, symbol_2.int0]. virtual handle is created for symbol_2.int0.
        inputAssignments = getColumnHandlesFor(columnHandlesWithSymbols, ImmutableList.of("symbol_2"));
        inputProjections = ImmutableList.of(symbol2Field0, symbolVariableMapping.get("symbol_2"));
        projectionResult = metadata.applyProjection(session, tableHandle, inputProjections, inputAssignments);
        expectedProjections = ImmutableList.of(new Variable("onelevelrow0#f_int0", BIGINT), symbolVariableMapping.get("symbol_2"));
        expectedAssignments = ImmutableMap.of("onelevelrow0#f_int0", BIGINT, "symbol_2", oneLevelRowType);
        assertProjectionResult(projectionResult, false, expectedProjections, expectedAssignments);
        // Round-2: input projections [symbol_2.int0 and onelevelrow0#f_int0]. Virtual handle is reused.
        Assignment newlyCreatedColumn = getOnlyElement(projectionResult.get().getAssignments().stream().filter(handle -> handle.getVariable().equals("onelevelrow0#f_int0")).collect(toList()));
        inputAssignments = ImmutableMap.<String, ColumnHandle>builder().putAll(getColumnHandlesFor(columnHandlesWithSymbols, ImmutableList.of("symbol_2"))).put(newlyCreatedColumn.getVariable(), newlyCreatedColumn.getColumn()).buildOrThrow();
        inputProjections = ImmutableList.of(symbol2Field0, new Variable("onelevelrow0#f_int0", BIGINT));
        projectionResult = metadata.applyProjection(session, tableHandle, inputProjections, inputAssignments);
        expectedProjections = ImmutableList.of(new Variable("onelevelrow0#f_int0", BIGINT), new Variable("onelevelrow0#f_int0", BIGINT));
        expectedAssignments = ImmutableMap.of("onelevelrow0#f_int0", BIGINT);
        assertProjectionResult(projectionResult, false, expectedProjections, expectedAssignments);
    } finally {
        dropTable(tableName);
    }
}
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Example 3 with FieldDereference

use of io.trino.spi.expression.FieldDereference in project trino by trinodb.

the class TestTableScanRedirectionWithPushdown method mockApplyProjection.

private Optional<ProjectionApplicationResult<ConnectorTableHandle>> mockApplyProjection(ConnectorSession session, ConnectorTableHandle tableHandle, List<ConnectorExpression> projections, Map<String, ColumnHandle> assignments) {
    MockConnectorTableHandle handle = (MockConnectorTableHandle) tableHandle;
    ImmutableList.Builder<ColumnHandle> newColumnsBuilder = ImmutableList.builder();
    ImmutableList.Builder<ConnectorExpression> outputExpressions = ImmutableList.builder();
    ImmutableList.Builder<Assignment> outputAssignments = ImmutableList.builder();
    for (ConnectorExpression projection : projections) {
        String newVariableName;
        ColumnHandle newColumnHandle;
        if (projection instanceof Variable) {
            newVariableName = ((Variable) projection).getName();
            newColumnHandle = assignments.get(newVariableName);
        } else if (projection instanceof FieldDereference) {
            FieldDereference dereference = (FieldDereference) projection;
            if (!(dereference.getTarget() instanceof Variable)) {
                throw new UnsupportedOperationException();
            }
            String dereferenceTargetName = ((Variable) dereference.getTarget()).getName();
            newVariableName = ((MockConnectorColumnHandle) assignments.get(dereferenceTargetName)).getName() + "#" + dereference.getField();
            newColumnHandle = new MockConnectorColumnHandle(newVariableName, projection.getType());
        } else {
            throw new UnsupportedOperationException();
        }
        Variable newVariable = new Variable(newVariableName, projection.getType());
        newColumnsBuilder.add(newColumnHandle);
        outputExpressions.add(newVariable);
        outputAssignments.add(new Assignment(newVariableName, newColumnHandle, projection.getType()));
    }
    List<ColumnHandle> newColumns = newColumnsBuilder.build();
    if (handle.getColumns().isPresent() && newColumns.equals(handle.getColumns().get())) {
        return Optional.empty();
    }
    return Optional.of(new ProjectionApplicationResult<>(new MockConnectorTableHandle(handle.getTableName(), handle.getConstraint(), Optional.of(newColumns)), outputExpressions.build(), outputAssignments.build(), false));
}
Also used : ColumnHandle(io.trino.spi.connector.ColumnHandle) MockConnectorColumnHandle(io.trino.connector.MockConnectorColumnHandle) Variable(io.trino.spi.expression.Variable) ImmutableList(com.google.common.collect.ImmutableList) ConnectorExpression(io.trino.spi.expression.ConnectorExpression) Assignment(io.trino.spi.connector.Assignment) FieldDereference(io.trino.spi.expression.FieldDereference) MockConnectorTableHandle(io.trino.connector.MockConnectorTableHandle) MockConnectorColumnHandle(io.trino.connector.MockConnectorColumnHandle)

Example 4 with FieldDereference

use of io.trino.spi.expression.FieldDereference in project trino by trinodb.

the class TestPushProjectionIntoTableScan method mockApplyProjection.

private Optional<ProjectionApplicationResult<ConnectorTableHandle>> mockApplyProjection(ConnectorSession session, ConnectorTableHandle tableHandle, List<ConnectorExpression> projections, Map<String, ColumnHandle> assignments) {
    // Prepare new table handle
    SchemaTableName inputSchemaTableName = ((MockConnectorTableHandle) tableHandle).getTableName();
    SchemaTableName projectedTableName = new SchemaTableName(inputSchemaTableName.getSchemaName(), "projected_" + inputSchemaTableName.getTableName());
    // Prepare new column handles
    ImmutableList.Builder<ConnectorExpression> outputExpressions = ImmutableList.builder();
    ImmutableList.Builder<Assignment> outputAssignments = ImmutableList.builder();
    ImmutableList.Builder<ColumnHandle> projectedColumnsBuilder = ImmutableList.builder();
    for (ConnectorExpression projection : projections) {
        String variablePrefix;
        if (projection instanceof Variable) {
            variablePrefix = "projected_variable_";
        } else if (projection instanceof FieldDereference) {
            variablePrefix = "projected_dereference_";
        } else if (projection instanceof Constant) {
            variablePrefix = "projected_constant_";
        } else if (projection instanceof Call) {
            variablePrefix = "projected_call_";
        } else {
            throw new UnsupportedOperationException();
        }
        String newVariableName = variablePrefix + projection.toString();
        Variable newVariable = new Variable(newVariableName, projection.getType());
        ColumnHandle newColumnHandle = new TpchColumnHandle(newVariableName, projection.getType());
        outputExpressions.add(newVariable);
        outputAssignments.add(new Assignment(newVariableName, newColumnHandle, projection.getType()));
        projectedColumnsBuilder.add(newColumnHandle);
    }
    return Optional.of(new ProjectionApplicationResult<>(new MockConnectorTableHandle(projectedTableName, TupleDomain.all(), Optional.of(projectedColumnsBuilder.build())), outputExpressions.build(), outputAssignments.build(), false));
}
Also used : TpchColumnHandle(io.trino.plugin.tpch.TpchColumnHandle) ColumnHandle(io.trino.spi.connector.ColumnHandle) FunctionCall(io.trino.sql.tree.FunctionCall) Call(io.trino.spi.expression.Call) Variable(io.trino.spi.expression.Variable) TpchColumnHandle(io.trino.plugin.tpch.TpchColumnHandle) ImmutableList.toImmutableList(com.google.common.collect.ImmutableList.toImmutableList) ImmutableList(com.google.common.collect.ImmutableList) ConnectorExpression(io.trino.spi.expression.ConnectorExpression) Constant(io.trino.spi.expression.Constant) SchemaTableName(io.trino.spi.connector.SchemaTableName) Assignment(io.trino.spi.connector.Assignment) FieldDereference(io.trino.spi.expression.FieldDereference) MockConnectorTableHandle(io.trino.connector.MockConnectorTableHandle)

Aggregations

ImmutableList (com.google.common.collect.ImmutableList)4 FieldDereference (io.trino.spi.expression.FieldDereference)4 Variable (io.trino.spi.expression.Variable)4 Assignment (io.trino.spi.connector.Assignment)3 ColumnHandle (io.trino.spi.connector.ColumnHandle)3 ConnectorExpression (io.trino.spi.expression.ConnectorExpression)3 ImmutableList.toImmutableList (com.google.common.collect.ImmutableList.toImmutableList)2 MockConnectorTableHandle (io.trino.connector.MockConnectorTableHandle)2 SchemaTableName (io.trino.spi.connector.SchemaTableName)2 MoreObjects.toStringHelper (com.google.common.base.MoreObjects.toStringHelper)1 Preconditions.checkArgument (com.google.common.base.Preconditions.checkArgument)1 Preconditions.checkState (com.google.common.base.Preconditions.checkState)1 Verify.verify (com.google.common.base.Verify.verify)1 ImmutableMap (com.google.common.collect.ImmutableMap)1 ImmutableMap.toImmutableMap (com.google.common.collect.ImmutableMap.toImmutableMap)1 ImmutableMultimap (com.google.common.collect.ImmutableMultimap)1 ImmutableSet (com.google.common.collect.ImmutableSet)1 ImmutableSet.toImmutableSet (com.google.common.collect.ImmutableSet.toImmutableSet)1 Iterables.concat (com.google.common.collect.Iterables.concat)1 Iterables.getOnlyElement (com.google.common.collect.Iterables.getOnlyElement)1