wuchong commented on a change in pull request #8730:
[FLINK-12834][table-planner-blink] Support CharType and BinaryType
URL: https://github.com/apache/flink/pull/8730#discussion_r296087336
##########
File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/typeutils/TypeCoercion.scala
##########
@@ -63,13 +64,14 @@ object TypeCoercion {
*/
def canSafelyCast(
from: LogicalType, to: LogicalType): Boolean = (from.getTypeRoot,
to.getTypeRoot) match {
- case (_, VARCHAR) => true
+ case (_, VARCHAR | CHAR) => true
case (_, DECIMAL) if isNumeric(from) => true
- case (_, _) if numericWideningPrecedence.contains(from) &&
- numericWideningPrecedence.contains(to) =>
- if (numericWideningPrecedence.indexOf(from) <
numericWideningPrecedence.indexOf(to)) {
+ case (_, _) if numericWideningPrecedence.contains(from.copy(true)) &&
+ numericWideningPrecedence.contains(to.copy(true)) =>
+ if (numericWideningPrecedence.indexOf(from.copy(true)) <
+ numericWideningPrecedence.indexOf(to.copy(true))) {
Review comment:
What about add both NULLABLE and NOT NULL types to
`numericWideningPrecedence`, so that we can avoid the verbose ` xx.copy(true)`
in the code.
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