buptljy commented on a change in pull request #9843: [FLINK-14296] [Table SQL]
Use Optional for optional parameters in parser module
URL: https://github.com/apache/flink/pull/9843#discussion_r334316882
##########
File path:
flink-table/flink-sql-parser/src/main/java/org/apache/flink/sql/parser/ddl/SqlCreateTable.java
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@@ -76,7 +80,7 @@ public SqlCreateTable(
SqlCharStringLiteral comment) {
super(OPERATOR, pos, false, false);
this.tableName = requireNonNull(tableName, "Table name is
missing");
- this.columnList = requireNonNull(columnList, "Column list
should not be null");
+ this.columnList = columnList;
Review comment:
Done. To distinguish two kind of fields(which can't be missing and which can
be missing but can't be null), I add different error messages.
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