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[FLINK-12234][hive] Support view related operations in HiveCatalog
This PR supports view related operations in HiveCatalog and creates HiveCatalogView. This closes apache#8434.
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110
...ink-connector-hive/src/main/java/org/apache/flink/table/catalog/hive/HiveCatalogView.java
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| /* | ||
| * 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 | ||
| * | ||
| * https://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. | ||
| */ | ||
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| package org.apache.flink.table.catalog.hive; | ||
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| import org.apache.flink.table.api.TableSchema; | ||
| import org.apache.flink.table.catalog.CatalogBaseTable; | ||
| import org.apache.flink.table.catalog.CatalogView; | ||
| import org.apache.flink.util.StringUtils; | ||
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| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.Optional; | ||
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| import static org.apache.flink.util.Preconditions.checkArgument; | ||
| import static org.apache.flink.util.Preconditions.checkNotNull; | ||
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| /** | ||
| * A Hive catalog view implementation. | ||
| */ | ||
| public class HiveCatalogView implements CatalogView { | ||
| // Original text of the view definition. | ||
| private final String originalQuery; | ||
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| // Expanded text of the original view definition | ||
| // This is needed because the context such as current DB is | ||
| // lost after the session, in which view is defined, is gone. | ||
| // Expanded query text takes care of the this, as an example. | ||
| private final String expandedQuery; | ||
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| // Schema of the view (column names and types) | ||
| private final TableSchema tableSchema; | ||
| // Properties of the view | ||
| private final Map<String, String> properties; | ||
| // Comment of the view | ||
| private String comment = "This is a hive catalog view."; | ||
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| public HiveCatalogView( | ||
| String originalQuery, | ||
| String expandedQuery, | ||
| TableSchema tableSchema, | ||
| Map<String, String> properties, | ||
| String comment) { | ||
| checkArgument(!StringUtils.isNullOrWhitespaceOnly(originalQuery), "original query cannot be null or empty"); | ||
| checkArgument(!StringUtils.isNullOrWhitespaceOnly(expandedQuery), "expanded query cannot be null or empty"); | ||
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| this.originalQuery = originalQuery; | ||
| this.expandedQuery = expandedQuery; | ||
| this.tableSchema = checkNotNull(tableSchema, "tableSchema cannot be null"); | ||
| this.properties = checkNotNull(properties, "properties cannot be null"); | ||
| this.comment = comment; | ||
| } | ||
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| @Override | ||
| public String getOriginalQuery() { | ||
| return originalQuery; | ||
| } | ||
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| @Override | ||
| public String getExpandedQuery() { | ||
| return expandedQuery; | ||
| } | ||
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| @Override | ||
| public Map<String, String> getProperties() { | ||
| return properties; | ||
| } | ||
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| @Override | ||
| public TableSchema getSchema() { | ||
| return tableSchema; | ||
| } | ||
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| @Override | ||
| public String getComment() { | ||
| return comment; | ||
| } | ||
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| @Override | ||
| public CatalogBaseTable copy() { | ||
| return new HiveCatalogView( | ||
| originalQuery, expandedQuery, tableSchema.copy(), new HashMap<>(properties), comment); | ||
| } | ||
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| @Override | ||
| public Optional<String> getDescription() { | ||
| return Optional.ofNullable(comment); | ||
| } | ||
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| @Override | ||
| public Optional<String> getDetailedDescription() { | ||
| // TODO: return a detailed description | ||
| return Optional.ofNullable(comment); | ||
| } | ||
| } |
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