Adding SparkSQL to DatabaseType and adding SaprkSQLPaginationQueryPro…

spring-batch-infrastructure/src/main/java/org/springframework/batch/infrastructure/item/database/support/SparkSqlPagingQueryProvider.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2006-2022 the original author or authors.
+ *
+ * Licensed 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.
+ */
+
+package org.springframework.batch.infrastructure.item.database.support;
+
+import org.springframework.batch.infrastructure.item.database.PagingQueryProvider;
+import org.springframework.util.StringUtils;
+
+/**
+ * SparkSQL implementation of a {@link PagingQueryProvider} using database specific
+ * features.
+ *
+ * @author Rahul Kumar
+ * @since 2.0
+ */
+public class SparkSqlPagingQueryProvider extends AbstractSqlPagingQueryProvider {
+
+	@Override
+	public String generateFirstPageQuery(int pageSize) {
+		return SqlPagingQueryUtils.generateLimitSqlQuery(this, false, buildLimitClause(pageSize));
+	}
+
+	@Override
+	public String generateRemainingPagesQuery(int pageSize) {
+		if (StringUtils.hasText(getGroupClause())) {
+			return SqlPagingQueryUtils.generateLimitGroupedSqlQuery(this, buildLimitClause(pageSize));
+		}
+		else {
+			return SqlPagingQueryUtils.generateLimitSqlQuery(this, true, buildLimitClause(pageSize));
+		}
+	}
+
+	private String buildLimitClause(int pageSize) {
+		return "LIMIT " + pageSize;
+	}
+
+}

spring-batch-infrastructure/src/main/java/org/springframework/batch/infrastructure/item/database/support/SqlPagingQueryProviderFactoryBean.java

@@ -30,6 +30,7 @@
 import static org.springframework.batch.infrastructure.support.DatabaseType.SQLITE;
 import static org.springframework.batch.infrastructure.support.DatabaseType.SQLSERVER;
 import static org.springframework.batch.infrastructure.support.DatabaseType.SYBASE;
+import static org.springframework.batch.infrastructure.support.DatabaseType.SPARKSQL;
 
 import java.util.HashMap;
 import java.util.LinkedHashMap;
@@ -89,6 +90,7 @@ public class SqlPagingQueryProviderFactoryBean implements FactoryBean<PagingQuer
 		providers.put(SQLITE, new SqlitePagingQueryProvider());
 		providers.put(SQLSERVER, new SqlServerPagingQueryProvider());
 		providers.put(SYBASE, new SybasePagingQueryProvider());
+		providers.put(SPARKSQL, new SparkSqlPagingQueryProvider());
 	}
 
 	/**

spring-batch-infrastructure/src/main/java/org/springframework/batch/infrastructure/support/DatabaseType.java

@@ -43,7 +43,8 @@ public enum DatabaseType {
 
 	DERBY("Apache Derby"), DB2("DB2"), DB2VSE("DB2VSE"), DB2ZOS("DB2ZOS"), DB2AS400("DB2AS400"),
 	HSQL("HSQL Database Engine"), SQLSERVER("Microsoft SQL Server"), MYSQL("MySQL"), ORACLE("Oracle"),
-	POSTGRES("PostgreSQL"), SYBASE("Sybase"), H2("H2"), SQLITE("SQLite"), HANA("HDB"), MARIADB("MariaDB");
+	POSTGRES("PostgreSQL"), SYBASE("Sybase"), H2("H2"), SQLITE("SQLite"), HANA("HDB"), MARIADB("MariaDB"),
+	SPARKSQL("SparkSQL");
 
 	private static final Map<String, DatabaseType> DATABASE_TYPES = Arrays.stream(DatabaseType.values())
 		.collect(Collectors.toMap(DatabaseType::getProductName, Function.identity()));

spring-batch-infrastructure/src/test/java/org/springframework/batch/infrastructure/item/database/support/SparkSqlPagingQueryProviderTests.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2006-2022 the original author or authors.
+ *
+ * Licensed 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.
+ */
+package org.springframework.batch.infrastructure.item.database.support;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.batch.infrastructure.item.database.Order;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * @author Rahul Kumar
+ */
+class SparkSqlPagingQueryProviderTests extends AbstractSqlPagingQueryProviderTests {
+
+	SparkSqlPagingQueryProviderTests() {
+		pagingQueryProvider = new SparkSqlPagingQueryProvider();
+	}
+
+	@Test
+	@Override
+	void testGenerateFirstPageQuery() {
+		String sql = "SELECT id, name, age FROM foo WHERE bar = 1 ORDER BY id ASC LIMIT 100";
+		String s = pagingQueryProvider.generateFirstPageQuery(pageSize);
+		assertEquals(sql, s);
+	}
+
+	@Test
+	@Override
+	void testGenerateRemainingPagesQuery() {
+		String sql = "SELECT id, name, age FROM foo WHERE (bar = 1) AND ((id > ?)) ORDER BY id ASC LIMIT 100";
+		String s = pagingQueryProvider.generateRemainingPagesQuery(pageSize);
+		assertEquals(sql, s);
+	}
+
+	@Override
+	@Test
+	void testGenerateFirstPageQueryWithGroupBy() {
+		pagingQueryProvider.setGroupClause("dep");
+		String sql = "SELECT id, name, age FROM foo WHERE bar = 1 GROUP BY dep ORDER BY id ASC LIMIT 100";
+		String s = pagingQueryProvider.generateFirstPageQuery(pageSize);
+		assertEquals(sql, s);
+	}
+
+	@Override
+	@Test
+	void testGenerateRemainingPagesQueryWithGroupBy() {
+		pagingQueryProvider.setGroupClause("dep");
+		String sql = "SELECT *  FROM (SELECT id, name, age FROM foo WHERE bar = 1 GROUP BY dep) AS MAIN_QRY WHERE ((id > ?)) ORDER BY id ASC LIMIT 100";
+		String s = pagingQueryProvider.generateRemainingPagesQuery(pageSize);
+		assertEquals(sql, s);
+	}
+
+	@Test
+	void testFirstPageSqlWithAliases() {
+		Map<String, Order> sorts = new HashMap<>();
+		sorts.put("owner.id", Order.ASCENDING);
+
+		this.pagingQueryProvider = new SparkSqlPagingQueryProvider();
+		this.pagingQueryProvider.setSelectClause("SELECT owner.id as ownerid, first_name, last_name, dog_name ");
+		this.pagingQueryProvider.setFromClause("FROM dog_owner owner INNER JOIN dog ON owner.id = dog.id ");
+		this.pagingQueryProvider.setSortKeys(sorts);
+
+		String firstPage = this.pagingQueryProvider.generateFirstPageQuery(5);
+		String remainingPagesQuery = this.pagingQueryProvider.generateRemainingPagesQuery(5);
+
+		assertEquals(
+				"SELECT owner.id as ownerid, first_name, last_name, dog_name FROM dog_owner owner INNER JOIN dog ON owner.id = dog.id ORDER BY owner.id ASC LIMIT 5",
+				firstPage);
+		assertEquals(
+				"SELECT owner.id as ownerid, first_name, last_name, dog_name FROM dog_owner owner INNER JOIN dog ON owner.id = dog.id WHERE ((owner.id > ?)) ORDER BY owner.id ASC LIMIT 5",
+				remainingPagesQuery);
+	}
+
+	@Override
+	String getFirstPageSqlWithMultipleSortKeys() {
+		return "SELECT id, name, age FROM foo WHERE bar = 1 ORDER BY name ASC, id DESC LIMIT 100";
+	}
+
+	@Override
+	String getRemainingSqlWithMultipleSortKeys() {
+		return "SELECT id, name, age FROM foo WHERE (bar = 1) AND ((name > ?) OR (name = ? AND id < ?)) ORDER BY name ASC, id DESC LIMIT 100";
+	}
+
+}