beryllw commented on code in PR #2331:
URL: https://github.com/apache/fluss/pull/2331#discussion_r2675489067
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fluss-lake/fluss-lake-paimon/src/main/java/org/apache/fluss/lake/paimon/PaimonLakeCatalog.java:
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@@ -133,69 +138,118 @@ public void alterTable(TablePath tablePath,
List<TableChange> tableChanges, Cont
}
}
- private boolean shouldAlterTable(TablePath tablePath, List<TableChange>
tableChanges)
+ private List<TableChange> checkAndFilterDuplicateTableChanges(
+ TablePath tablePath,
+ List<TableChange> tableChanges,
+ org.apache.fluss.metadata.Schema flussSchema)
throws TableNotExistException {
+ if (tableChanges.isEmpty()) {
+ return tableChanges;
+ }
+
try {
+ // Get current Paimon table schema
Table table = paimonCatalog.getTable(toPaimon(tablePath));
FileStoreTable fileStoreTable = (FileStoreTable) table;
- Schema currentSchema = fileStoreTable.schema().toSchema();
-
- for (TableChange change : tableChanges) {
- if (change instanceof TableChange.AddColumn) {
- TableChange.AddColumn addColumn = (TableChange.AddColumn)
change;
- if (!isColumnAlreadyExists(currentSchema, addColumn)) {
- return true;
- }
- } else {
- return true;
+ List<DataField> paimonFields =
+ fileStoreTable.schema().toSchema().fields().stream()
+ .filter(field ->
!SYSTEM_COLUMNS.containsKey(field.name()))
+ .collect(Collectors.toList());
+ List<org.apache.fluss.metadata.Schema.Column> flussColumns =
flussSchema.getColumns();
+
+ if (paimonFields.size() < flussColumns.size()) {
+ throw new InvalidAlterTableException(
+ String.format(
+ "Paimon table has less columns (%d) than Fluss
schema (%d)",
+ paimonFields.size(), flussColumns.size()));
+ }
+
+ // Validate schema compatibility
+ validateExistingColumns(paimonFields, flussColumns);
+
+ if (paimonFields.size() == flussColumns.size()) {
+ return tableChanges;
+ }
+
+ // if paimon column size is greater than expected fluss column
size, meaning last add
+ // columns are failed.
+ // Thus, this time must be retried to keep the schema same, only
then can add new
+ // columns or other operations next time.
+ String errorMsg =
+ String.format(
+ "Paimon table has more columns (%d) than Fluss
schema (%d), thus need to add the diff columns at once rather than other table
changes %s.",
+ paimonFields.size(), flussColumns.size(),
tableChanges);
+ if (flussColumns.size() + tableChanges.size() !=
paimonFields.size()) {
+ throw new InvalidAlterTableException(errorMsg);
+ }
+
+ for (int i = 0; i < paimonFields.size() - flussColumns.size();
i++) {
+ DataField paimonDataField = paimonFields.get(i +
flussColumns.size());
+ TableChange tableChange = tableChanges.get(i);
+ if (!(tableChange instanceof TableChange.AddColumn
+ && ((TableChange.AddColumn) tableChange).getPosition()
+ == TableChange.ColumnPosition.last()
Review Comment:
Maybe we could perform this check earlier—it’s not related to the existing
Paimon schema. Also, it’s already validated here:
https://github.com/apache/fluss/blob/256bd7f3838a72965720eb2a8c6c7c0575f46b07/fluss-server/src/main/java/org/apache/fluss/server/coordinator/SchemaUpdate.java#L101-L104
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