srkukarni commented on a change in pull request #2265: Initial implementation of Pulsar SQL URL: https://github.com/apache/incubator-pulsar/pull/2265#discussion_r206726273
########## File path: pulsar-sql/presto-pulsar/src/main/java/org/apache/pulsar/sql/presto/PulsarMetadata.java ########## @@ -0,0 +1,383 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ +package org.apache.pulsar.sql.presto; + +import com.facebook.presto.spi.ColumnHandle; +import com.facebook.presto.spi.ColumnMetadata; +import com.facebook.presto.spi.ConnectorSession; +import com.facebook.presto.spi.ConnectorTableHandle; +import com.facebook.presto.spi.ConnectorTableLayout; +import com.facebook.presto.spi.ConnectorTableLayoutHandle; +import com.facebook.presto.spi.ConnectorTableLayoutResult; +import com.facebook.presto.spi.ConnectorTableMetadata; +import com.facebook.presto.spi.Constraint; +import com.facebook.presto.spi.PrestoException; +import com.facebook.presto.spi.SchemaTableName; +import com.facebook.presto.spi.SchemaTablePrefix; +import com.facebook.presto.spi.TableNotFoundException; +import com.facebook.presto.spi.connector.ConnectorMetadata; +import com.facebook.presto.spi.type.BigintType; +import com.facebook.presto.spi.type.BooleanType; +import com.facebook.presto.spi.type.DoubleType; +import com.facebook.presto.spi.type.IntegerType; +import com.facebook.presto.spi.type.RealType; +import com.facebook.presto.spi.type.Type; +import com.facebook.presto.spi.type.VarbinaryType; +import com.facebook.presto.spi.type.VarcharType; +import com.google.common.annotations.VisibleForTesting; +import com.google.common.collect.ImmutableList; +import com.google.common.collect.ImmutableMap; +import io.airlift.log.Logger; +import org.apache.avro.LogicalType; +import org.apache.avro.LogicalTypes; +import org.apache.avro.Schema; +import org.apache.avro.SchemaParseException; +import org.apache.commons.lang3.StringUtils; +import org.apache.pulsar.client.admin.PulsarAdmin; +import org.apache.pulsar.client.admin.PulsarAdminException; +import org.apache.pulsar.client.api.PulsarClientException; +import org.apache.pulsar.common.naming.TopicName; +import org.apache.pulsar.common.schema.SchemaInfo; + +import javax.inject.Inject; +import java.util.LinkedList; +import java.util.List; +import java.util.Map; +import java.util.Optional; +import java.util.Set; +import java.util.function.Consumer; + +import static org.apache.pulsar.sql.presto.PulsarHandleResolver.convertColumnHandle; +import static org.apache.pulsar.sql.presto.PulsarHandleResolver.convertTableHandle; +import static com.facebook.presto.spi.StandardErrorCode.NOT_FOUND; +import static com.facebook.presto.spi.StandardErrorCode.NOT_SUPPORTED; +import static com.facebook.presto.spi.type.DateType.DATE; +import static com.facebook.presto.spi.type.TimeType.TIME; +import static com.facebook.presto.spi.type.TimestampType.TIMESTAMP; +import static java.util.Objects.requireNonNull; + +public class PulsarMetadata implements ConnectorMetadata { + + private final String connectorId; + private final PulsarAdmin pulsarAdmin; + + private static final Logger log = Logger.get(PulsarMetadata.class); + + @Inject + public PulsarMetadata(PulsarConnectorId connectorId, PulsarConnectorConfig pulsarConnectorConfig) { + this.connectorId = requireNonNull(connectorId, "connectorId is null").toString(); + try { + this.pulsarAdmin = pulsarConnectorConfig.getPulsarAdmin(); + } catch (PulsarClientException e) { + throw new RuntimeException(e); + } + } + + @Override + public List<String> listSchemaNames(ConnectorSession session) { + List<String> prestoSchemas = new LinkedList<>(); + try { + List<String> tenants = pulsarAdmin.tenants().getTenants(); + for (String tenant : tenants) { + prestoSchemas.addAll(pulsarAdmin.namespaces().getNamespaces(tenant)); + } + } catch (PulsarAdminException e) { + throw new RuntimeException("Failed to get schemas from pulsar", e); + } + return prestoSchemas; + } + + @Override + public ConnectorTableHandle getTableHandle(ConnectorSession session, SchemaTableName tableName) { + return new PulsarTableHandle( + this.connectorId, + tableName.getSchemaName(), + tableName.getTableName(), + tableName.getTableName()); + } + + @Override + public List<ConnectorTableLayoutResult> getTableLayouts(ConnectorSession session, ConnectorTableHandle table, + Constraint<ColumnHandle> constraint, + Optional<Set<ColumnHandle>> desiredColumns) { + PulsarTableHandle handle = convertTableHandle(table); + ConnectorTableLayout layout = new ConnectorTableLayout(new PulsarTableLayoutHandle(handle)); + return ImmutableList.of(new ConnectorTableLayoutResult(layout, constraint.getSummary())); + } + + @Override + public ConnectorTableLayout getTableLayout(ConnectorSession session, ConnectorTableLayoutHandle handle) { + return new ConnectorTableLayout(handle); + } + + @Override + public ConnectorTableMetadata getTableMetadata(ConnectorSession session, ConnectorTableHandle table) { + return getTableMetadata(convertTableHandle(table).toSchemaTableName(), true); + } + + @Override + public List<SchemaTableName> listTables(ConnectorSession session, String schemaNameOrNull) { Review comment: What happens if a schema contains tens of thousands of topics? 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