| /* |
| * 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.beam.sdk.extensions.sql.impl.parser; |
| |
| import static com.alibaba.fastjson.JSON.parseObject; |
| import static org.apache.beam.sdk.schemas.Schema.toSchema; |
| import static org.apache.beam.vendor.guava.v20_0.com.google.common.base.Preconditions.checkNotNull; |
| import static org.apache.calcite.util.Static.RESOURCE; |
| |
| import com.alibaba.fastjson.JSONObject; |
| import java.util.List; |
| import org.apache.beam.sdk.extensions.sql.impl.BeamCalciteSchema; |
| import org.apache.beam.sdk.extensions.sql.impl.utils.CalciteUtils; |
| import org.apache.beam.sdk.extensions.sql.meta.Table; |
| import org.apache.beam.sdk.schemas.Schema; |
| import org.apache.calcite.jdbc.CalcitePrepare; |
| import org.apache.calcite.jdbc.CalciteSchema; |
| import org.apache.calcite.sql.SqlCreate; |
| import org.apache.calcite.sql.SqlExecutableStatement; |
| import org.apache.calcite.sql.SqlIdentifier; |
| import org.apache.calcite.sql.SqlKind; |
| import org.apache.calcite.sql.SqlNode; |
| import org.apache.calcite.sql.SqlOperator; |
| import org.apache.calcite.sql.SqlSpecialOperator; |
| import org.apache.calcite.sql.SqlUtil; |
| import org.apache.calcite.sql.SqlWriter; |
| import org.apache.calcite.sql.parser.SqlParserPos; |
| import org.apache.calcite.util.Pair; |
| |
| /** Parse tree for {@code CREATE EXTERNAL TABLE} statement. */ |
| public class SqlCreateExternalTable extends SqlCreate implements SqlExecutableStatement { |
| private final SqlIdentifier name; |
| private final List<Schema.Field> columnList; |
| private final SqlNode type; |
| private final SqlNode comment; |
| private final SqlNode location; |
| private final SqlNode tblProperties; |
| |
| private static final SqlOperator OPERATOR = |
| new SqlSpecialOperator("CREATE EXTERNAL TABLE", SqlKind.OTHER_DDL); |
| |
| /** Creates a SqlCreateExternalTable. */ |
| public SqlCreateExternalTable( |
| SqlParserPos pos, |
| boolean replace, |
| boolean ifNotExists, |
| SqlIdentifier name, |
| List<Schema.Field> columnList, |
| SqlNode type, |
| SqlNode comment, |
| SqlNode location, |
| SqlNode tblProperties) { |
| super(OPERATOR, pos, replace, ifNotExists); |
| this.name = checkNotNull(name); |
| this.columnList = columnList; // may be null |
| this.type = checkNotNull(type); |
| this.comment = comment; // may be null |
| this.location = location; // may be null |
| this.tblProperties = tblProperties; // may be null |
| } |
| |
| @Override |
| public List<SqlNode> getOperandList() { |
| throw new UnsupportedOperationException( |
| "Getting operands CREATE TABLE is unsupported at the moment"); |
| } |
| |
| @Override |
| public void unparse(SqlWriter writer, int leftPrec, int rightPrec) { |
| writer.keyword("CREATE"); |
| writer.keyword("EXTERNAL"); |
| writer.keyword("TABLE"); |
| if (ifNotExists) { |
| writer.keyword("IF NOT EXISTS"); |
| } |
| name.unparse(writer, leftPrec, rightPrec); |
| |
| if (columnList != null) { |
| SqlWriter.Frame frame = writer.startList("(", ")"); |
| columnList.forEach(column -> unparseColumn(writer, column)); |
| writer.endList(frame); |
| } |
| writer.keyword("TYPE"); |
| type.unparse(writer, 0, 0); |
| if (comment != null) { |
| writer.keyword("COMMENT"); |
| comment.unparse(writer, 0, 0); |
| } |
| if (location != null) { |
| writer.keyword("LOCATION"); |
| location.unparse(writer, 0, 0); |
| } |
| if (tblProperties != null) { |
| writer.keyword("TBLPROPERTIES"); |
| tblProperties.unparse(writer, 0, 0); |
| } |
| } |
| |
| @Override |
| public void execute(CalcitePrepare.Context context) { |
| final Pair<CalciteSchema, String> pair = SqlDdlNodes.schema(context, true, name); |
| if (pair.left.plus().getTable(pair.right) != null) { |
| // Table exists. |
| if (!ifNotExists) { |
| // They did not specify IF NOT EXISTS, so give error. |
| throw SqlUtil.newContextException( |
| name.getParserPosition(), RESOURCE.tableExists(pair.right)); |
| } |
| return; |
| } |
| // Table does not exist. Create it. |
| if (!(pair.left.schema instanceof BeamCalciteSchema)) { |
| throw SqlUtil.newContextException( |
| name.getParserPosition(), |
| RESOURCE.internal("Schema is not instanceof BeamCalciteSchema")); |
| } |
| BeamCalciteSchema schema = (BeamCalciteSchema) pair.left.schema; |
| schema.getTableProvider().createTable(toTable()); |
| } |
| |
| private void unparseColumn(SqlWriter writer, Schema.Field column) { |
| writer.sep(","); |
| writer.identifier(column.getName()); |
| writer.identifier(CalciteUtils.toSqlTypeName(column.getType()).name()); |
| |
| if (column.getType().getNullable() != null && !column.getType().getNullable()) { |
| writer.keyword("NOT NULL"); |
| } |
| |
| if (column.getDescription() != null) { |
| writer.keyword("COMMENT"); |
| writer.literal(column.getDescription()); |
| } |
| } |
| |
| private Table toTable() { |
| return Table.builder() |
| .type(SqlDdlNodes.getString(type)) |
| .name(SqlDdlNodes.name(name)) |
| .schema(columnList.stream().collect(toSchema())) |
| .comment(SqlDdlNodes.getString(comment)) |
| .location(SqlDdlNodes.getString(location)) |
| .properties( |
| (tblProperties == null) |
| ? new JSONObject() |
| : parseObject(SqlDdlNodes.getString(tblProperties))) |
| .build(); |
| } |
| } |
| |
| // End SqlCreateExternalTable.java |