Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/21389#discussion_r190791115 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceUtils.scala --- @@ -0,0 +1,53 @@ +/* + * 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.execution.datasources + +import org.apache.spark.sql.types._ + + +object DataSourceUtils { + + /** + * Verify if the schema is supported in datasource. + */ + def verifySchema(format: String, schema: StructType): Unit = { + def verifyType(dataType: DataType): Unit = dataType match { + case BooleanType | ByteType | ShortType | IntegerType | LongType | FloatType | DoubleType | + StringType | BinaryType | DateType | TimestampType | _: DecimalType => + + case st: StructType => st.foreach { f => verifyType(f.dataType) } + + case ArrayType(elementType, _) => verifyType(elementType) + + case MapType(keyType, valueType, _) => + verifyType(keyType) + verifyType(valueType) + + case udt: UserDefinedType[_] => verifyType(udt.sqlType) + + // For backward-compatibility --- End diff -- Yes, as long as it does not break anything.
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