content: /*
   * 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.calcite.sql.dialect;
  
  import org.apache.calcite.avatica.util.TimeUnitRange;
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.sql.SqlCall;
  import org.apache.calcite.sql.SqlDialect;
  import org.apache.calcite.sql.SqlLiteral;
  import org.apache.calcite.sql.SqlNode;
  import org.apache.calcite.sql.SqlWriter;
  import org.apache.calcite.sql.fun.SqlFloorFunction;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import static org.apache.calcite.util.RelToSqlConverterUtil.unparseSparkArrayAndMap;
  
  /**
   * A <code>SqlDialect</code> implementation for the Doris database.
   */
  public class DorisSqlDialect extends StarRocksSqlDialect {
    public static final SqlDialect DEFAULT = new DorisSqlDialect(DEFAULT_CONTEXT);
  
    /**
     * Creates a DorisSqlDialect.
     */
    public DorisSqlDialect(Context context) {
      super(context);
    }
  
    @Override public void unparseCall(SqlWriter writer, SqlCall call, int leftPrec, int rightPrec) {
      switch (call.getKind()) {
      case MAP_VALUE_CONSTRUCTOR:
        unparseSparkArrayAndMap(writer, call, leftPrec, rightPrec);
        break;
      case FLOOR:
        if (call.operandCount() != 2) {
          super.unparseCall(writer, call, leftPrec, rightPrec);
          return;
        }
        final SqlLiteral timeUnitNode = call.operand(1);
        final TimeUnitRange timeUnit = timeUnitNode.getValueAs(TimeUnitRange.class);
        SqlCall newCall =
            SqlFloorFunction.replaceTimeUnitOperand(call, timeUnit.name(),
                timeUnitNode.getParserPosition());
        SqlFloorFunction.unparseDatetimeFunction(writer, newCall, "DATE_TRUNC", true);
        break;
      default:
        super.unparseCall(writer, call, leftPrec, rightPrec);
        break;
      }
    }
  
    @Override public @Nullable SqlNode getCastSpec(RelDataType type) {
      switch (type.getSqlTypeName()) {
      case UTINYINT:
      case USMALLINT:
      case UINTEGER:
      case UBIGINT:
        throw new RuntimeException(
            "Doris doesn't support UNSIGNED TINYINT/SMALLINT/INTEGER/BIGINT!");
      default:
        break;
      }
      return super.getCastSpec(type);
    }
  }
  