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.Casing;
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.sql.SqlDialect;
  import org.apache.calcite.sql.SqlNode;
  import org.apache.calcite.sql.SqlOperator;
  import org.apache.calcite.sql.SqlWriter;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  
  /**
   * A <code>SqlDialect</code> implementation for the Vertica database.
   */
  public class VerticaSqlDialect extends SqlDialect {
    public static final SqlDialect.Context DEFAULT_CONTEXT = SqlDialect.EMPTY_CONTEXT
        .withDatabaseProduct(SqlDialect.DatabaseProduct.VERTICA)
        .withIdentifierQuoteString("\"")
        .withUnquotedCasing(Casing.UNCHANGED);
  
    public static final SqlDialect DEFAULT = new VerticaSqlDialect(DEFAULT_CONTEXT);
  
    /** Creates a VerticaSqlDialect. */
    public VerticaSqlDialect(Context context) {
      super(context);
    }
  
    @Override public boolean supportsNestedAggregations() {
      return false;
    }
  
    @Override public boolean supportsFunction(SqlOperator operator,
        RelDataType type, final List<RelDataType> paramTypes) {
      switch (operator.kind) {
      case LIKE:
        // introduces support for ILIKE as well
        return true;
      default:
        return super.supportsFunction(operator, type, paramTypes);
      }
    }
  
    @Override public void unparseOffsetFetch(SqlWriter writer, @Nullable SqlNode offset,
        @Nullable SqlNode fetch) {
      unparseFetchUsingLimit(writer, offset, fetch);
    }
  }
  