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SQL Parser and Optimizer

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/*
 * 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 com.hazelcast.org.apache.calcite.sql.dialect;

import com.hazelcast.org.apache.calcite.avatica.util.Casing;
import com.hazelcast.org.apache.calcite.sql.SqlDialect;

/**
 * A SqlDialect implementation for the Snowflake database.
 */
public class SnowflakeSqlDialect extends SqlDialect {
  public static final SqlDialect.Context DEFAULT_CONTEXT = SqlDialect.EMPTY_CONTEXT
      .withDatabaseProduct(SqlDialect.DatabaseProduct.SNOWFLAKE)
      .withIdentifierQuoteString("\"")
      .withUnquotedCasing(Casing.TO_UPPER);

  public static final SqlDialect DEFAULT =
      new SnowflakeSqlDialect(DEFAULT_CONTEXT);

  /** Creates a SnowflakeSqlDialect. */
  public SnowflakeSqlDialect(Context context) {
    super(context);
  }

  @Override public boolean supportsApproxCountDistinct() {
    return true;
  }
}