todd5167 commented on a change in pull request #15755:
URL: https://github.com/apache/flink/pull/15755#discussion_r621808605
##########
File path:
flink-table/flink-table-planner-blink/src/main/java/org/apache/flink/table/planner/utils/OperationConverterUtils.java
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@@ -144,6 +149,116 @@ public static Operation convertChangeColumn(
// TODO: handle watermark and constraints
}
+ public static Operation convertRenameColumn(
+ ObjectIdentifier tableIdentifier,
+ String originColumnName,
+ String newColumnName,
+ CatalogTable catalogTable) {
+
+ Schema modifiedTableSchema = catalogTable.getUnresolvedSchema();
+ validateColumnName(originColumnName, newColumnName,
modifiedTableSchema);
+
+ Schema.Builder builder = Schema.newBuilder();
+ // build column
+ modifiedTableSchema.getColumns().stream()
+ .forEach(
+ column -> {
+ if (StringUtils.equals(column.getName(),
originColumnName)) {
+ buildNewColumnFromOriginColumn(builder,
column, newColumnName);
+ } else {
+ buildNewColumnFromOriginColumn(builder,
column, column.getName());
+ }
+ });
+ // build primary key column
+ List<String> originPrimaryKeyNames =
+ modifiedTableSchema
+ .getPrimaryKey()
+ .map(Schema.UnresolvedPrimaryKey::getColumnNames)
+ .orElseGet(Lists::newArrayList);
+
+ List<String> newPrimaryKeyNames =
+ originPrimaryKeyNames.stream()
+ .map(
+ pkName ->
+ StringUtils.equals(pkName,
originColumnName)
+ ? newColumnName
+ : pkName)
+ .collect(Collectors.toList());
+
+ if (newPrimaryKeyNames.size() > 0) {
+ builder.primaryKey(newPrimaryKeyNames);
+ }
+ // build watermark
+ modifiedTableSchema.getWatermarkSpecs().stream()
+ .forEach(
+ watermarkSpec -> {
+ String watermarkRefColumnName =
watermarkSpec.getColumnName();
+ Expression watermarkExpression =
watermarkSpec.getWatermarkExpression();
+ if (StringUtils.equals(watermarkRefColumnName,
originColumnName)) {
+ String newWatermarkExpression =
+ ((SqlCallExpression)
watermarkExpression)
+ .getSqlExpression()
+
.replace(watermarkRefColumnName, newColumnName);
Review comment:
@wuchong
Using org.apache.flink.table.catalog.DefaultSchemaResolver#resolve to
resolve a Schema is a good solution.
In my JIRA solution, SqlValidatorException can only throw Unknown
identifier'xxx' because the expression has been validated when the table is
created.
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