spark DescribeCommandSchema 源码
spark DescribeCommandSchema 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/DescribeCommandSchema.scala
/*
* 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.spark.sql.catalyst.plans
import org.apache.spark.sql.catalyst.expressions.AttributeReference
import org.apache.spark.sql.types.{MetadataBuilder, StringType}
private[sql] object DescribeCommandSchema {
def describeTableAttributes(): Seq[AttributeReference] = Seq(
AttributeReference("col_name", StringType, nullable = false,
new MetadataBuilder().putString("comment", "name of the column").build())(),
AttributeReference("data_type", StringType, nullable = false,
new MetadataBuilder().putString("comment", "data type of the column").build())(),
AttributeReference("comment", StringType, nullable = true,
new MetadataBuilder().putString("comment", "comment of the column").build())())
def describeColumnAttributes(): Seq[AttributeReference] = Seq(
AttributeReference("info_name", StringType, nullable = false,
new MetadataBuilder().putString("comment", "name of the column info").build())(),
AttributeReference("info_value", StringType, nullable = false,
new MetadataBuilder().putString("comment", "value of the column info").build())())
}
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