strongduanmu commented on code in PR #28314: URL: https://github.com/apache/shardingsphere/pull/28314#discussion_r1310968807
########## kernel/sql-federation/core/src/main/java/org/apache/shardingsphere/sqlfederation/compiler/converter/statement/insert/InsertStatementConverter.java: ########## @@ -0,0 +1,108 @@ +/* + * 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.sqlfederation.compiler.converter.statement.insert; + +import org.apache.calcite.sql.SqlBasicCall; +import org.apache.calcite.sql.SqlInsert; +import org.apache.calcite.sql.SqlNode; +import org.apache.calcite.sql.SqlNodeList; +import org.apache.calcite.sql.SqlSelect; +import org.apache.calcite.sql.SqlValuesOperator; +import org.apache.calcite.sql.fun.SqlRowOperator; +import org.apache.calcite.sql.parser.SqlParserPos; +import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.assignment.InsertValuesSegment; +import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.column.ColumnSegment; +import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.ExpressionSegment; +import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.subquery.SubquerySegment; +import org.apache.shardingsphere.sql.parser.sql.common.statement.dml.InsertStatement; +import org.apache.shardingsphere.sql.parser.sql.common.statement.dml.SelectStatement; +import org.apache.shardingsphere.sql.parser.sql.dialect.handler.dml.SelectStatementHandler; +import org.apache.shardingsphere.sqlfederation.compiler.converter.segment.expression.ExpressionConverter; +import org.apache.shardingsphere.sqlfederation.compiler.converter.segment.expression.impl.ColumnConverter; +import org.apache.shardingsphere.sqlfederation.compiler.converter.segment.from.TableConverter; +import org.apache.shardingsphere.sqlfederation.compiler.converter.segment.groupby.GroupByConverter; +import org.apache.shardingsphere.sqlfederation.compiler.converter.segment.groupby.HavingConverter; +import org.apache.shardingsphere.sqlfederation.compiler.converter.segment.projection.DistinctConverter; +import org.apache.shardingsphere.sqlfederation.compiler.converter.segment.projection.ProjectionsConverter; +import org.apache.shardingsphere.sqlfederation.compiler.converter.segment.where.WhereConverter; +import org.apache.shardingsphere.sqlfederation.compiler.converter.segment.window.WindowConverter; +import org.apache.shardingsphere.sqlfederation.compiler.converter.statement.SQLStatementConverter; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.List; +import java.util.stream.Collectors; + +/** + * Insert statement converter. + */ +public final class InsertStatementConverter implements SQLStatementConverter<InsertStatement, SqlNode> { + + @Override + public SqlNode convert(final InsertStatement insertStatement) { + return convertInsert(insertStatement); + } + + private SqlInsert convertInsert(final InsertStatement insertStatement) { + SqlNode table = new TableConverter().convert(insertStatement.getTable()).orElseThrow(IllegalStateException::new); + SqlParserPos position = SqlParserPos.ZERO; + SqlNodeList keywords = new SqlNodeList(position); + SqlNode source; + if (insertStatement.getInsertSelect().isPresent()) { + source = convertSelect(insertStatement.getInsertSelect().get()); + } else { + source = convertValues(insertStatement.getValues()); + } + SqlNodeList columnList = convertColumn(insertStatement.getColumns()); + return new SqlInsert(SqlParserPos.ZERO, keywords, table, source, columnList); + } + + private SqlNode convertSelect(final SubquerySegment subquerySegment) { + SelectStatement selectStatement = subquerySegment.getSelect(); + SqlNodeList distinct = new DistinctConverter().convert(selectStatement.getProjections()).orElse(null); + SqlNodeList projection = new ProjectionsConverter().convert(selectStatement.getProjections()).orElseThrow(IllegalStateException::new); + SqlNode from = new TableConverter().convert(selectStatement.getFrom()).orElse(null); + SqlNode where = selectStatement.getWhere().flatMap(optional -> new WhereConverter().convert(optional)).orElse(null); + SqlNodeList groupBy = selectStatement.getGroupBy().flatMap(optional -> new GroupByConverter().convert(optional)).orElse(null); + SqlNode having = selectStatement.getHaving().flatMap(optional -> new HavingConverter().convert(optional)).orElse(null); + SqlNodeList window = SelectStatementHandler.getWindowSegment(selectStatement).flatMap(new WindowConverter()::convert).orElse(SqlNodeList.EMPTY); + return new SqlSelect(SqlParserPos.ZERO, distinct, projection, from, where, groupBy, having, window, null, null, null, null, SqlNodeList.EMPTY); + } + + private SqlNode convertValues(final Collection<InsertValuesSegment> insertValuesSegments) { + List<SqlNode> values = new ArrayList<>(); + for (InsertValuesSegment each : insertValuesSegments) { + values.add(convertExpression(each.getValues().get(0))); + } + List<SqlNode> operands = new ArrayList<>(); + operands.add(new SqlBasicCall(new SqlRowOperator("ROW"), values, SqlParserPos.ZERO)); + return new SqlBasicCall(new SqlValuesOperator(), operands, SqlParserPos.ZERO); + } + + private SqlNodeList convertColumn(final Collection<ColumnSegment> columnSegments) { + List<SqlNode> columns = columnSegments.stream().map(each -> new ColumnConverter().convert(each).orElseThrow(IllegalStateException::new)).collect(Collectors.toList()); + if (columns.size() == 0) { Review Comment: Please put 0 on the left condition. -- This is an automated message from the Apache Git Service. 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