Package com.facebook.presto.spi

Examples of com.facebook.presto.spi.ColumnMetadata

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        InformationSchemaTableHandle informationSchemaTableHandle = checkTableHandle(tableHandle);
        ConnectorTableMetadata tableMetadata = TABLES.get(informationSchemaTableHandle.getSchemaTableName());

        String columnName = checkType(columnHandle, InformationSchemaColumnHandle.class, "columnHandle").getColumnName();

        ColumnMetadata columnMetadata = findColumnMetadata(tableMetadata, columnName);
        checkArgument(columnMetadata != null, "Column %s on table %s does not exist", columnName, tableMetadata.getTable());
        return columnMetadata;
    }
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            for (Entry<ColumnHandle, Comparable<?>> entry : partition.getTupleDomain().extractFixedValues().entrySet()) {
                ColumnHandle columnHandle = entry.getKey();
                String columnName = columnHandles.get(columnHandle);
                String value = null;
                if (entry.getValue() != null) {
                    ColumnMetadata columnMetadata  = metadata.getColumnMetadata(tableHandle.get(), columnHandle);
                    try {
                        FunctionInfo operator = metadata.getExactOperator(OperatorType.CAST, VarcharType.VARCHAR, ImmutableList.of(columnMetadata.getType()));
                        value = ((Slice) operator.getMethodHandle().invokeWithArguments(entry.getValue())).toStringUtf8();
                    }
                    catch (OperatorNotFoundException e) {
                        value = "<UNREPRESENTABLE VALUE>";
                    }
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        ImmutableListMultimap.Builder<SchemaTableName, ColumnMetadata> columns = ImmutableListMultimap.builder();
        for (TableColumn tableColumn : dao.listTableColumns(connectorId, prefix.getSchemaName(), prefix.getTableName())) {
            if (tableColumn.getColumnName().equals(SAMPLE_WEIGHT_COLUMN_NAME)) {
                continue;
            }
            ColumnMetadata columnMetadata = new ColumnMetadata(tableColumn.getColumnName(), tableColumn.getDataType(), tableColumn.getOrdinalPosition(), false);
            columns.put(tableColumn.getTable(), columnMetadata);
        }
        return Multimaps.asMap(columns.build());
    }
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        List<ColumnMetadata> actualColumns = actual.getColumns();
        List<ColumnMetadata> expectedColumns = expected.getColumns();
        assertEquals(actualColumns.size(), expectedColumns.size());
        for (int i = 0; i < actualColumns.size(); i++) {
            ColumnMetadata actualColumn = actualColumns.get(i);
            ColumnMetadata expectedColumn = expectedColumns.get(i);
            assertEquals(actualColumn.getName(), expectedColumn.getName());
            assertEquals(actualColumn.getType(), expectedColumn.getType());
        }
    }
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    {
        // known table
        ConnectorTableMetadata tableMetadata = metadata.getTableMetadata(NUMBERS_TABLE_HANDLE);
        assertEquals(tableMetadata.getTable(), new SchemaTableName("example", "numbers"));
        assertEquals(tableMetadata.getColumns(), ImmutableList.of(
                new ColumnMetadata("text", VARCHAR, 0, false),
                new ColumnMetadata("value", BIGINT, 1, false)));

        // unknown tables should produce null
        assertNull(metadata.getTableMetadata(new ExampleTableHandle(CONNECTOR_ID, "unknown", "unknown")));
        assertNull(metadata.getTableMetadata(new ExampleTableHandle(CONNECTOR_ID, "example", "unknown")));
        assertNull(metadata.getTableMetadata(new ExampleTableHandle(CONNECTOR_ID, "unknown", "numbers")));
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    @Test
    public void getColumnMetadata()
    {
        assertEquals(metadata.getColumnMetadata(NUMBERS_TABLE_HANDLE, new ExampleColumnHandle(CONNECTOR_ID, "text", VARCHAR, 0)),
                new ColumnMetadata("text", VARCHAR, 0, false));

        // example connector assumes that the table handle and column handle are
        // properly formed, so it will return a metadata object for any
        // ExampleTableHandle and ExampleColumnHandle passed in.  This is on because
        // it is not possible for the Presto Metadata system to create the handles
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    @Test(expectedExceptions = UnsupportedOperationException.class)
    public void testCreateTable()
    {
        metadata.createTable(SESSION, new ConnectorTableMetadata(
                new SchemaTableName("example", "foo"),
                ImmutableList.of(new ColumnMetadata("text", VARCHAR, 0, false))));
    }
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    }

    private static void assertReadFields(RecordCursor cursor, List<ColumnMetadata> schema)
    {
        for (int columnIndex = 0; columnIndex < schema.size(); columnIndex++) {
            ColumnMetadata column = schema.get(columnIndex);
            if (!cursor.isNull(columnIndex)) {
                switch (column.getType()) {
                    case BOOLEAN:
                        cursor.getBoolean(columnIndex);
                        break;
                    case LONG:
                        cursor.getLong(columnIndex);
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    @Test
    public void testColumnMetadata()
    {
        assertEquals(exampleTable.getColumnsMetadata(), ImmutableList.of(
                new ColumnMetadata("a", ColumnType.STRING, 0, false),
                new ColumnMetadata("b", ColumnType.LONG, 1, false)));
    }
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    {
        // known table
        ConnectorTableMetadata tableMetadata = metadata.getTableMetadata(NUMBERS_TABLE_HANDLE);
        assertEquals(tableMetadata.getTable(), new SchemaTableName("example", "numbers"));
        assertEquals(tableMetadata.getColumns(), ImmutableList.of(
                new ColumnMetadata("text", STRING, 0, false),
                new ColumnMetadata("value", ColumnType.LONG, 1, false)));

        // unknown tables should produce null
        assertNull(metadata.getTableMetadata(new ExampleTableHandle(CONNECTOR_ID, "unknown", "unknown")));
        assertNull(metadata.getTableMetadata(new ExampleTableHandle(CONNECTOR_ID, "example", "unknown")));
        assertNull(metadata.getTableMetadata(new ExampleTableHandle(CONNECTOR_ID, "unknown", "numbers")));
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Related Classes of com.facebook.presto.spi.ColumnMetadata

  • com.facebook.presto.AbstractTestQueries
  • com.facebook.presto.cassandra.CassandraColumnHandle
  • com.facebook.presto.cassandra.TestCassandraConnector
  • com.facebook.presto.connector.informationSchema.InformationSchemaDataStreamProvider
  • com.facebook.presto.connector.informationSchema.InformationSchemaMetadata
  • com.facebook.presto.connector.informationSchema.InformationSchemaPageSourceProvider
  • com.facebook.presto.connector.jmx.JmxColumnHandle
  • com.facebook.presto.connector.system.SystemDataStreamProvider
  • com.facebook.presto.connector.system.SystemRecordSetProvider
  • com.facebook.presto.connector.system.SystemTablesMetadata
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