loserwang1024 commented on code in PR #2331:
URL: https://github.com/apache/fluss/pull/2331#discussion_r2693500453
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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:
@beryllw
> It’s not related to the existing Paimon schema
If paimon schema is same as fluss schema, all the operations(both add column
and set config) can be accepted. Otherwise, only add columns can be accepted to
make the schema same.
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