| /* |
| * 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.samza.sql.planner; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import org.apache.calcite.rel.type.RelDataType; |
| import org.apache.calcite.rel.type.RelDataTypeField; |
| import org.apache.calcite.rel.type.RelDataTypeFieldImpl; |
| import org.apache.calcite.rel.type.RelDataTypeSystem; |
| import org.apache.calcite.rel.type.RelRecordType; |
| import org.apache.calcite.sql.type.ArraySqlType; |
| import org.apache.calcite.sql.type.MapSqlType; |
| import org.apache.calcite.sql.type.SqlTypeFactoryImpl; |
| import org.apache.calcite.sql.type.SqlTypeName; |
| import org.apache.samza.SamzaException; |
| import org.apache.samza.sql.schema.SqlFieldSchema; |
| import org.apache.samza.sql.schema.SqlSchema; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| /** |
| * Class that converts the {@link SqlSchema} to Calcite relational schema |
| */ |
| public class RelSchemaConverter extends SqlTypeFactoryImpl { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(RelSchemaConverter.class); |
| |
| public RelSchemaConverter() { |
| super(RelDataTypeSystem.DEFAULT); |
| } |
| |
| public RelDataType convertToRelSchema(SqlSchema sqlSchema) { |
| return convertRecordType(sqlSchema); |
| } |
| |
| private RelDataType convertRecordType(SqlSchema schema) { |
| List<RelDataTypeField> relFields = getRelFields(schema.getFields()); |
| return new RelRecordType(relFields); |
| } |
| |
| private List<RelDataTypeField> getRelFields(List<SqlSchema.SqlField> fields) { |
| List<RelDataTypeField> relFields = new ArrayList<>(); |
| |
| for (SqlSchema.SqlField field : fields) { |
| String fieldName = field.getFieldName(); |
| int fieldPos = field.getPosition(); |
| RelDataType dataType = getRelDataType(field.getFieldSchema()); |
| relFields.add(new RelDataTypeFieldImpl(fieldName, fieldPos, dataType)); |
| } |
| |
| return relFields; |
| } |
| |
| // TODO: SAMZA-2345 - Change RelSchemaConverter code to apply nullability based on Sql schema. |
| private RelDataType getRelDataType(SqlFieldSchema fieldSchema) { |
| switch (fieldSchema.getFieldType()) { |
| case ARRAY: |
| RelDataType elementType = getRelDataType(fieldSchema.getElementSchema()); |
| return new ArraySqlType(elementType, true); |
| case BOOLEAN: |
| return createTypeWithNullability(createSqlType(SqlTypeName.BOOLEAN), true); |
| case DOUBLE: |
| return createTypeWithNullability(createSqlType(SqlTypeName.DOUBLE), true); |
| case REAL: |
| return createTypeWithNullability(createSqlType(SqlTypeName.REAL), true); |
| case FLOAT: |
| return createTypeWithNullability(createSqlType(SqlTypeName.FLOAT), true); |
| case STRING: |
| return createTypeWithNullability(createSqlType(SqlTypeName.VARCHAR), true); |
| case BYTES: |
| return createTypeWithNullability(createSqlType(SqlTypeName.VARBINARY), true); |
| case INT16: |
| case INT32: |
| return createTypeWithNullability(createSqlType(SqlTypeName.INTEGER), true); |
| case INT64: |
| return createTypeWithNullability(createSqlType(SqlTypeName.BIGINT), true); |
| case ROW: |
| case ANY: |
| // TODO Calcite execution engine doesn't support record type yet. |
| return createTypeWithNullability(createSqlType(SqlTypeName.ANY), true); |
| case MAP: |
| RelDataType valueType = getRelDataType(fieldSchema.getValueScehma()); |
| return new MapSqlType(createSqlType(SqlTypeName.VARCHAR), valueType, true); |
| default: |
| String msg = String.format("Field Type %s is not supported", fieldSchema.getFieldType()); |
| LOG.error(msg); |
| throw new SamzaException(msg); |
| } |
| } |
| } |