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.beam.sdk.extensions.sql.impl.parser;
  
  import java.util.List;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlCall;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlDataTypeSpec;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlIdentifier;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlKind;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlNode;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlOperator;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlSpecialOperator;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlWriter;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.parser.SqlParserPos;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  
  /** Parse tree for column. */
  public class SqlColumnDeclaration extends SqlCall {
    private static final SqlSpecialOperator OPERATOR =
        new SqlSpecialOperator("COLUMN_DECL", SqlKind.COLUMN_DECL);
  
    final SqlIdentifier name;
    final SqlDataTypeSpec dataType;
    final SqlNode comment;
  
    /** Creates a SqlColumnDeclaration; use {@link SqlDdlNodes#column}. */
    SqlColumnDeclaration(
        SqlParserPos pos, SqlIdentifier name, SqlDataTypeSpec dataType, SqlNode comment) {
      super(pos);
      this.name = name;
      this.dataType = dataType;
      this.comment = comment;
    }
  
    @Override
    public SqlOperator getOperator() {
      return OPERATOR;
    }
  
    @Override
    public List<SqlNode> getOperandList() {
      return ImmutableList.of(name, dataType);
    }
  
    @Override
    public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
      name.unparse(writer, 0, 0);
      dataType.unparse(writer, 0, 0);
      Boolean nullable = dataType.getNullable();
      if (nullable != null && !nullable) {
        writer.keyword("NOT NULL");
      }
      if (comment != null) {
        writer.keyword("COMMENT");
        comment.unparse(writer, 0, 0);
      }
    }
  }
  
  // End SqlColumnDeclaration.java
  