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113 changes: 113 additions & 0 deletions
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api/src/main/java/com/datastrato/gravitino/SupportsSchemas.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 | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
||
| // Referred from Apache Spark's connector/catalog implementation | ||
| // sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/SupportNamespaces.java | ||
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| package com.datastrato.gravitino; | ||
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| import com.datastrato.gravitino.annotation.Evolving; | ||
| import com.datastrato.gravitino.exceptions.NoSuchCatalogException; | ||
| import com.datastrato.gravitino.exceptions.NoSuchSchemaException; | ||
| import com.datastrato.gravitino.exceptions.NonEmptySchemaException; | ||
| import com.datastrato.gravitino.exceptions.SchemaAlreadyExistsException; | ||
| import java.util.Map; | ||
|
|
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| /** | ||
| * The client interface to support schema operations. The server side should use the other one with | ||
| * the same name in the core module. | ||
| */ | ||
| @Evolving | ||
| public interface SupportsSchemas { | ||
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| /** | ||
| * List schemas under the entity. | ||
| * | ||
| * <p>If an entity such as a table, view exists, its parent schemas must also exist and must be | ||
| * returned by this discovery method. For example, if table a.b.t exists, this method invoked as | ||
| * listSchemas(a) must return [a.b] in the result array | ||
| * | ||
| * @return An array of schema identifier under the namespace. | ||
| * @throws NoSuchCatalogException If the catalog does not exist. | ||
| */ | ||
| NameIdentifier[] listSchemas() throws NoSuchCatalogException; | ||
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| /** | ||
| * Check if a schema exists. | ||
| * | ||
| * <p>If an entity such as a table, view exists, its parent namespaces must also exist. For | ||
| * example, if table a.b.t exists, this method invoked as schemaExists(a.b) must return true. | ||
| * | ||
| * @param schemaName The name of the schema. | ||
| * @return True if the schema exists, false otherwise. | ||
| */ | ||
| default boolean schemaExists(String schemaName) { | ||
| try { | ||
| loadSchema(schemaName); | ||
| return true; | ||
| } catch (NoSuchSchemaException e) { | ||
| return false; | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Create a schema in the catalog. | ||
| * | ||
| * @param schemaName The name of the schema. | ||
| * @param comment The comment of the schema. | ||
| * @param properties The properties of the schema. | ||
| * @return The created schema. | ||
| * @throws NoSuchCatalogException If the catalog does not exist. | ||
| * @throws SchemaAlreadyExistsException If the schema already exists. | ||
| */ | ||
| Schema createSchema(String schemaName, String comment, Map<String, String> properties) | ||
| throws NoSuchCatalogException, SchemaAlreadyExistsException; | ||
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| /** | ||
| * Load metadata properties for a schema. | ||
| * | ||
| * @param schemaName The name of the schema. | ||
| * @return A schema. | ||
| * @throws NoSuchSchemaException If the schema does not exist (optional). | ||
| */ | ||
| Schema loadSchema(String schemaName) throws NoSuchSchemaException; | ||
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| /** | ||
| * Apply the metadata change to a schema in the catalog. | ||
| * | ||
| * @param schemaName The name of the schema. | ||
| * @param changes The metadata changes to apply. | ||
| * @return The altered schema. | ||
| * @throws NoSuchSchemaException If the schema does not exist. | ||
| */ | ||
| Schema alterSchema(String schemaName, SchemaChange... changes) throws NoSuchSchemaException; | ||
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| /** | ||
| * Drop a schema from the catalog. If cascade option is true, recursively drop all objects within | ||
| * the schema. | ||
| * | ||
| * <p>If the catalog implementation does not support this operation, it may throw {@link | ||
| * UnsupportedOperationException}. | ||
| * | ||
| * @param schemaName The name of the schema. | ||
| * @param cascade If true, recursively drop all objects within the schema. | ||
| * @return True if the schema exists and is dropped successfully, false if the schema doesn't | ||
| * exist. | ||
| * @throws NonEmptySchemaException If the schema is not empty and cascade is false. | ||
| */ | ||
| boolean dropSchema(String schemaName, boolean cascade) throws NonEmptySchemaException; | ||
| } |
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