cloud-fan commented on a change in pull request #25198: [SPARK-28443][SQL]
Spark sql add exception when create field type NullType
URL: https://github.com/apache/spark/pull/25198#discussion_r312005630
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/rules.scala
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@@ -393,6 +394,75 @@ case class PreprocessTableInsertion(conf: SQLConf)
extends Rule[LogicalPlan] {
}
}
+/**
+ * SPARK-28443: fail the DDL command if it creates a table with null-type
columns
+ */
+object DDLCheck extends (LogicalPlan => Unit) {
+
+ def failAnalysis(msg: String): Unit = { throw new AnalysisException(msg) }
+
+ def throwWhenExistsNullType(dataType: DataType): Unit = {
+ dataType match {
+ case ArrayType(elementType, _) =>
+ throwWhenExistsNullType(elementType)
+
+ case MapType(keyType, valueType, _) =>
+ throwWhenExistsNullType(keyType)
+ throwWhenExistsNullType(valueType)
+
+ case StructType(fields) =>
+ fields.foreach{field => throwWhenExistsNullType(field.dataType)}
+
+ case other if other == NullType =>
+ failAnalysis("DataType NullType is not supported for create table.")
Review comment:
how about "cannot create tables with null-type column/field"
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