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Posted to notifications@shardingsphere.apache.org by GitBox <gi...@apache.org> on 2021/06/22 04:31:21 UTC
[GitHub] [shardingsphere] tristaZero commented on a change in pull request #10889: Convert ss ast to calcite ast
tristaZero commented on a change in pull request #10889:
URL: https://github.com/apache/shardingsphere/pull/10889#discussion_r655861368
##########
File path: shardingsphere-infra/shardingsphere-infra-optimize/src/main/java/org/apache/shardingsphere/infra/optimize/core/convert/converter/impl/ExpressionSqlNodeConverter.java
##########
@@ -0,0 +1,54 @@
+/*
+ * 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.shardingsphere.infra.optimize.core.convert.converter.impl;
+
+import org.apache.calcite.sql.SqlNode;
+import org.apache.shardingsphere.infra.optimize.core.convert.converter.SqlNodeConverter;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.column.ColumnSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.BinaryOperationExpression;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.ExpressionSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.ListExpression;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.complex.CommonExpressionSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.simple.LiteralExpressionSegment;
+
+import java.util.Optional;
+
+/**
+ * Expression converter entry.
+ */
+public final class ExpressionSqlNodeConverter implements SqlNodeConverter<ExpressionSegment, SqlNode> {
+ @Override
+ public Optional<SqlNode> convert(ExpressionSegment expression) {
+ if (expression == null) {
+ return null;
Review comment:
return Optional.empty()?
##########
File path: shardingsphere-infra/shardingsphere-infra-optimize/src/main/java/org/apache/shardingsphere/infra/optimize/core/convert/converter/impl/OrderBySqlNodeConverter.java
##########
@@ -0,0 +1,42 @@
+/*
+ * 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.shardingsphere.infra.optimize.core.convert.converter.impl;
+
+import org.apache.calcite.sql.SqlNode;
+import org.apache.calcite.sql.SqlNodeList;
+import org.apache.calcite.sql.parser.SqlParserPos;
+import org.apache.shardingsphere.infra.optimize.core.convert.converter.SqlNodeConverter;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.order.OrderBySegment;
+
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Order by converter.
+ */
+public final class OrderBySqlNodeConverter extends AbstractOrderBySqlNodeConverter implements SqlNodeConverter<OrderBySegment, SqlNodeList> {
+
Review comment:
Please keep the same check style for other classes.
##########
File path: shardingsphere-infra/shardingsphere-infra-optimize/src/main/java/org/apache/shardingsphere/infra/optimize/core/convert/converter/impl/ExpressionSqlNodeConverter.java
##########
@@ -0,0 +1,54 @@
+/*
+ * 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.shardingsphere.infra.optimize.core.convert.converter.impl;
+
+import org.apache.calcite.sql.SqlNode;
+import org.apache.shardingsphere.infra.optimize.core.convert.converter.SqlNodeConverter;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.column.ColumnSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.BinaryOperationExpression;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.ExpressionSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.ListExpression;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.complex.CommonExpressionSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.simple.LiteralExpressionSegment;
+
+import java.util.Optional;
+
+/**
+ * Expression converter entry.
+ */
+public final class ExpressionSqlNodeConverter implements SqlNodeConverter<ExpressionSegment, SqlNode> {
+ @Override
Review comment:
A new line above this line is expected to add.
##########
File path: shardingsphere-infra/shardingsphere-infra-optimize/src/test/java/org/apache/shardingsphere/infra/optimize/core/convert/SqlNodeConverterTest.java
##########
@@ -0,0 +1,139 @@
+/*
+ * 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.shardingsphere.infra.optimize.core.convert;
+
+import org.apache.calcite.sql.SqlJoin;
+import org.apache.calcite.sql.SqlNode;
+import org.apache.calcite.sql.SqlSelect;
+import org.apache.shardingsphere.infra.database.type.DatabaseTypeRegistry;
+import org.apache.shardingsphere.infra.database.type.dialect.MySQLDatabaseType;
+import org.apache.shardingsphere.infra.parser.ShardingSphereSQLParserEngine;
+import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.Optional;
+
+import static org.hamcrest.CoreMatchers.instanceOf;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * testcase of converting shardingshphere ast to calcite ast.
+ *
+ * <p>after converting phrase finished, the next phrase is comparing the converted result with the
+ * result of calcite parser.
+ * </p>
+ */
+public final class SqlNodeConverterTest {
+
+ private ShardingSphereSQLParserEngine sqlStatementParserEngine;
+
+ @Before
+ public void init() {
+ sqlStatementParserEngine = new ShardingSphereSQLParserEngine(DatabaseTypeRegistry.getTrunkDatabaseTypeName(
+ new MySQLDatabaseType()));
+ }
+
+ @Test
+ public void testConvertSimpleSelect() {
+ String sql = "select order_id, user_id from t_order";
+ SQLStatement sqlStatement = sqlStatementParserEngine.parse(sql, false);
+ Optional<SqlNode> optional = SqlNodeConverter.convert(sqlStatement);
+ assertTrue(optional.isPresent());
+ Assert.assertThat(optional.get(), instanceOf(SqlSelect.class));
+ SqlSelect sqlSelect = (SqlSelect) optional.get();
+ Assert.assertEquals(2, sqlSelect.getSelectList().size());
+ Assert.assertNull(sqlSelect.getWhere());
+ /*
+ TODO compare ast from calcite parser and ast converted from ss ast if possible
+ SqlParser parser = SqlParser.create(sql);
+ SqlNode calciteSqlNode = parser.parseQuery();
+ Assert.assertNotNull(calciteSqlNode);
+ */
+ }
+
+ @Test
+ public void testConvertSimpleSelectFilter() {
+ String sql = "select order_id, user_id from t_order where order_id = 10";
+ SQLStatement sqlStatement = sqlStatementParserEngine.parse(sql, false);
+
Review comment:
Could you remove these blank lines? If you really want to make your coding descriptive, please consider creating functions for them.
##########
File path: shardingsphere-infra/shardingsphere-infra-optimize/src/main/java/org/apache/shardingsphere/infra/optimize/core/convert/converter/impl/JoinTableSqlNodeConverter.java
##########
@@ -0,0 +1,75 @@
+/*
+ * 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.shardingsphere.infra.optimize.core.convert.converter.impl;
+
+import org.apache.calcite.sql.JoinConditionType;
+import org.apache.calcite.sql.JoinType;
+import org.apache.calcite.sql.SqlJoin;
+import org.apache.calcite.sql.SqlLiteral;
+import org.apache.calcite.sql.SqlNode;
+import org.apache.calcite.sql.parser.SqlParserPos;
+import org.apache.shardingsphere.infra.optimize.core.convert.converter.SqlNodeConverter;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.ExpressionSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.generic.table.JoinTableSegment;
+
+import java.util.Optional;
+
+/**
+ * Join converter.
+ */
+public final class JoinTableSqlNodeConverter implements SqlNodeConverter<JoinTableSegment, SqlNode> {
+
+ private static final String JOIN_TYPE_INNER = "INNER";
+
+ private static final String JOIN_TYPE_LEFT = "LEFT";
+
+ private static final String JOIN_TYPE_RIGHT = "RIGHT";
+
+ private static final String JOIN_TYPE_FULL = "FULL";
+
+ @Override
+ public Optional<SqlNode> convert(JoinTableSegment join) {
+ String joinType = join.getJoinType();
+ SqlNode left = new TableSqlNodeConverter().convert(join.getLeft()).get();
+ SqlNode right = new TableSqlNodeConverter().convert(join.getRight()).get();
+ ExpressionSegment expressionSegment = join.getCondition();
+ Optional<SqlNode> condition = new ExpressionSqlNodeConverter().convert(expressionSegment);
+
Review comment:
These blank lines are suggested to remove. ### If you want to isolate `SqlLiteral conditionType`, a new function will make it better.
##########
File path: shardingsphere-infra/shardingsphere-infra-optimize/src/main/java/org/apache/shardingsphere/infra/optimize/core/convert/converter/impl/GroupBySqlNodeConverter.java
##########
@@ -0,0 +1,46 @@
+/*
+ * 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.shardingsphere.infra.optimize.core.convert.converter.impl;
+
+import org.apache.calcite.sql.SqlNode;
+import org.apache.calcite.sql.SqlNodeList;
+import org.apache.calcite.sql.parser.SqlParserPos;
+import org.apache.shardingsphere.infra.optimize.core.convert.converter.SqlNodeConverter;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.order.GroupBySegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.order.item.OrderByItemSegment;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Group by converter.
+ */
+public final class GroupBySqlNodeConverter extends AbstractOrderBySqlNodeConverter implements SqlNodeConverter<GroupBySegment, SqlNodeList> {
+ @Override
Review comment:
A new line above this line is expected to add.
##########
File path: shardingsphere-infra/shardingsphere-infra-optimize/src/test/java/org/apache/shardingsphere/infra/optimize/core/convert/SqlNodeConverterTest.java
##########
@@ -0,0 +1,139 @@
+/*
+ * 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.shardingsphere.infra.optimize.core.convert;
+
+import org.apache.calcite.sql.SqlJoin;
+import org.apache.calcite.sql.SqlNode;
+import org.apache.calcite.sql.SqlSelect;
+import org.apache.shardingsphere.infra.database.type.DatabaseTypeRegistry;
+import org.apache.shardingsphere.infra.database.type.dialect.MySQLDatabaseType;
+import org.apache.shardingsphere.infra.parser.ShardingSphereSQLParserEngine;
+import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.Optional;
+
+import static org.hamcrest.CoreMatchers.instanceOf;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * testcase of converting shardingshphere ast to calcite ast.
+ *
+ * <p>after converting phrase finished, the next phrase is comparing the converted result with the
+ * result of calcite parser.
+ * </p>
+ */
+public final class SqlNodeConverterTest {
Review comment:
This class is suggested to rename as SelectStatementConverterTest, since it just mentions `SelectStatment` coverting.
##########
File path: shardingsphere-infra/shardingsphere-infra-optimize/src/test/java/org/apache/shardingsphere/infra/optimize/core/convert/SqlNodeConverterTest.java
##########
@@ -0,0 +1,139 @@
+/*
+ * 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.shardingsphere.infra.optimize.core.convert;
+
+import org.apache.calcite.sql.SqlJoin;
+import org.apache.calcite.sql.SqlNode;
+import org.apache.calcite.sql.SqlSelect;
+import org.apache.shardingsphere.infra.database.type.DatabaseTypeRegistry;
+import org.apache.shardingsphere.infra.database.type.dialect.MySQLDatabaseType;
+import org.apache.shardingsphere.infra.parser.ShardingSphereSQLParserEngine;
+import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.Optional;
+
+import static org.hamcrest.CoreMatchers.instanceOf;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * testcase of converting shardingshphere ast to calcite ast.
+ *
+ * <p>after converting phrase finished, the next phrase is comparing the converted result with the
+ * result of calcite parser.
+ * </p>
+ */
+public final class SqlNodeConverterTest {
+
+ private ShardingSphereSQLParserEngine sqlStatementParserEngine;
+
+ @Before
+ public void init() {
+ sqlStatementParserEngine = new ShardingSphereSQLParserEngine(DatabaseTypeRegistry.getTrunkDatabaseTypeName(
+ new MySQLDatabaseType()));
+ }
+
+ @Test
+ public void testConvertSimpleSelect() {
+ String sql = "select order_id, user_id from t_order";
+ SQLStatement sqlStatement = sqlStatementParserEngine.parse(sql, false);
+ Optional<SqlNode> optional = SqlNodeConverter.convert(sqlStatement);
+ assertTrue(optional.isPresent());
+ Assert.assertThat(optional.get(), instanceOf(SqlSelect.class));
+ SqlSelect sqlSelect = (SqlSelect) optional.get();
+ Assert.assertEquals(2, sqlSelect.getSelectList().size());
Review comment:
Could you import `Assert.assertEquals` to avoid `Assert.` expression? Plus, please check other calls. Thanks.
##########
File path: shardingsphere-infra/shardingsphere-infra-optimize/src/test/java/org/apache/shardingsphere/infra/optimize/core/convert/SqlNodeConverterTest.java
##########
@@ -0,0 +1,139 @@
+/*
+ * 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.shardingsphere.infra.optimize.core.convert;
+
+import org.apache.calcite.sql.SqlJoin;
+import org.apache.calcite.sql.SqlNode;
+import org.apache.calcite.sql.SqlSelect;
+import org.apache.shardingsphere.infra.database.type.DatabaseTypeRegistry;
+import org.apache.shardingsphere.infra.database.type.dialect.MySQLDatabaseType;
+import org.apache.shardingsphere.infra.parser.ShardingSphereSQLParserEngine;
+import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.Optional;
+
+import static org.hamcrest.CoreMatchers.instanceOf;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * testcase of converting shardingshphere ast to calcite ast.
+ *
+ * <p>after converting phrase finished, the next phrase is comparing the converted result with the
+ * result of calcite parser.
+ * </p>
+ */
+public final class SqlNodeConverterTest {
Review comment:
Hey, it is better to be `final` class.
##########
File path: shardingsphere-infra/shardingsphere-infra-optimize/src/main/java/org/apache/shardingsphere/infra/optimize/core/convert/converter/impl/SelectStatementSqlNodeConverter.java
##########
@@ -22,20 +22,69 @@
import org.apache.calcite.sql.SqlSelect;
import org.apache.calcite.sql.parser.SqlParserPos;
import org.apache.shardingsphere.infra.optimize.core.convert.converter.SqlNodeConverter;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.pagination.PaginationValueSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.pagination.limit.LimitSegment;
import org.apache.shardingsphere.sql.parser.sql.common.statement.dml.SelectStatement;
+import org.apache.shardingsphere.sql.parser.sql.dialect.handler.dml.SelectStatementHandler;
+import java.util.AbstractMap;
+import java.util.Map;
import java.util.Optional;
/**
* Select statement sql node converter.
*/
-public final class SelectStatementSqlNodeConverter implements SqlNodeConverter<SelectStatement> {
+public final class SelectStatementSqlNodeConverter implements SqlNodeConverter<SelectStatement, SqlNode> {
@Override
public Optional<SqlNode> convert(final SelectStatement selectStatement) {
- Optional<SqlNode> distinct = new DistinctSqlNodeConverter().convert(selectStatement.getProjections());
- // TODO : prepare other sqlNodes referring to `distinct`.
- return Optional.of(new SqlSelect(SqlParserPos.ZERO, (SqlNodeList) distinct.orElse(null), null, null, null, null, null,
- null, null, null, null, null));
+ Optional<SqlNodeList> distinct = new DistinctSqlNodeConverter().convert(selectStatement.getProjections());
+ Optional<SqlNodeList> projections = new ProjectionsSqlNodeConverter().convert(selectStatement.getProjections());
+ Optional<SqlNode> from = new TableSqlNodeConverter().convert(selectStatement.getFrom());
+ Optional<SqlNode> where = new WhereSqlNodeConverter().convert(selectStatement.getWhere().orElse(null));
+ Optional<SqlNodeList> groupBy = new GroupBySqlNodeConverter().convert(selectStatement.getGroupBy().orElse(null));
+ Optional<SqlNode> having = new HavingSqlNodeConverter().convert(selectStatement.getHaving().orElse(null));
+ Optional<SqlNodeList> orderBy = new OrderBySqlNodeConverter().convert(selectStatement.getOrderBy().orElse(null));
+ Optional<LimitSegment> limit = SelectStatementHandler.getLimitSegment(selectStatement);
+ Map.Entry<SqlNode, SqlNode> offsetRowCount = convertPagination(limit.orElse(null));
+ return Optional.of(new SqlSelect(SqlParserPos.ZERO,
+ distinct.orElse(null),
+ projections.orElse(null),
+ from.orElse(null),
+ where.orElse(null),
+ groupBy.orElse(null),
+ having.orElse(null),
+ null,
+ orderBy.orElse(null),
+ offsetRowCount.getKey(),
+ offsetRowCount.getValue(),
+ null));
}
+
+ /**
+ * convert pagination.
+ * @param limitSegment pagination clause
+ * @return offset and fetch <code>SqlNode</code>.
+ */
+ public static Map.Entry<SqlNode, SqlNode> convertPagination(final LimitSegment limitSegment) {
Review comment:
Do you think whether we can split it into two classes, i.e.,`covertOffsetSqlNode` and c`overtFetchSqlnode`?
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