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[FLINK-39284][table] CREATE OR ALTER MATERIALIZED TABLE doesn't respect schema of existing table #27807

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[FLINK-39284][table] CREATE OR ALTER MATERIALIZED TABLE doesn't respect schema of existing table #27807

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a44fbe7
[FLINK-39284][table] Extract test for `CREATE OR ALTER MATERIALIZED T…
snuyanzin Mar 22, 2026
7792e6c
[FLINK-39284][table] Make `CREATE OR ALTER MATERIALIZED TABLE` respec…
snuyanzin Mar 22, 2026
dce1236
[FLINK-39284][table] Nullify types for columns while `CREATE OR ALTER…
snuyanzin Mar 22, 2026
0bf8818
[FLINK-39284][table] Make `CREATE OR ALTER MATERIALIZED TABLE` respec…
snuyanzin Mar 22, 2026
add418d
[FLINK-39284][table] Make `CREATE OR ALTER MATERIALIZED TABLE` respec…
snuyanzin Mar 23, 2026
37d0f1d
Add test with new constraint
snuyanzin Mar 23, 2026
5a05a62
Add test with no table changes
snuyanzin Mar 23, 2026
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4 changes: 3 additions & 1 deletion ...i-java/src/main/java/org/apache/flink/table/operations/ddl/AlterTableChangeOperation.java
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Original file line number Diff line number Diff line change
Expand Up @@ -97,7 +97,9 @@ public static String toString(TableChange tableChange) {
return String.format(
" MODIFY %s COMMENT '%s'",
EncodingUtils.escapeIdentifier(modifyColumnComment.getNewColumn().getName()),
modifyColumnComment.getNewComment());
modifyColumnComment.getNewComment() == null
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@AHeise AHeise Mar 23, 2026

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2-3 commits before, we already had some changes to the comment logic. Can you double-check if the commits are correctly cut?

? ""
: modifyColumnComment.getNewComment());
Comment on lines +100 to +102
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@raminqaf raminqaf Mar 23, 2026

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Shouldn't we avoid MODIFY COMMENT if the comment is null, instead of returning:

MODIFY 'id' COMMENT ''

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@snuyanzin snuyanzin Mar 23, 2026

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no, this type modification means it is removed
since there is no a dedicated table change for that

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@raminqaf raminqaf Mar 23, 2026

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Got it thanks!

} else if (tableChange instanceof TableChange.ModifyPhysicalColumnType) {
TableChange.ModifyPhysicalColumnType modifyPhysicalColumnType =
(TableChange.ModifyPhysicalColumnType) tableChange;
Expand Down
136 changes: 99 additions & 37 deletions ...r/operations/converters/materializedtable/SqlCreateOrAlterMaterializedTableConverter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -24,14 +24,15 @@
import org.apache.flink.table.api.ValidationException;
import org.apache.flink.table.catalog.CatalogBaseTable.TableKind;
import org.apache.flink.table.catalog.CatalogMaterializedTable.RefreshMode;
import org.apache.flink.table.catalog.Column;
import org.apache.flink.table.catalog.ObjectIdentifier;
import org.apache.flink.table.catalog.ResolvedCatalogBaseTable;
import org.apache.flink.table.catalog.ResolvedCatalogMaterializedTable;
import org.apache.flink.table.catalog.ResolvedSchema;
import org.apache.flink.table.catalog.SchemaResolver;
import org.apache.flink.table.catalog.TableChange;
import org.apache.flink.table.catalog.TableDistribution;
import org.apache.flink.table.catalog.UniqueConstraint;
import org.apache.flink.table.catalog.WatermarkSpec;
import org.apache.flink.table.operations.Operation;
import org.apache.flink.table.operations.materializedtable.CreateMaterializedTableOperation;
import org.apache.flink.table.operations.materializedtable.FullAlterMaterializedTableOperation;
Expand Down Expand Up @@ -123,55 +124,116 @@ private Operation handleCreate(
private Function<ResolvedCatalogMaterializedTable, List<TableChange>> buildTableChanges(
final MergeContext mergeContext, final SchemaResolver schemaResolver) {
return oldTable -> {
final List<TableChange> changes = new ArrayList<>();
final List<TableChange> changes =
getSchemaTableChanges(mergeContext, schemaResolver, oldTable);

final ResolvedSchema oldSchema = oldTable.getResolvedSchema();
final List<Column> newColumns =
MaterializedTableUtils.validateAndExtractNewColumns(
oldSchema,
schemaResolver.resolve(mergeContext.getMergedSchema()),
mergeContext.hasSchemaDefinition());
changes.addAll(getQueryTableChanges(mergeContext, oldTable));
changes.addAll(getOptionsTableChanges(mergeContext, oldTable));
changes.addAll(getDistributionTableChanges(mergeContext, oldTable));

newColumns.forEach(column -> changes.add(TableChange.add(column)));
changes.add(
TableChange.modifyDefinitionQuery(
mergeContext.getMergedOriginalQuery(),
mergeContext.getMergedExpandedQuery()));
final RefreshMode oldRefreshMode = oldTable.getRefreshMode();
final RefreshMode newRefreshMode = mergeContext.getMergedRefreshMode();
if (oldRefreshMode != newRefreshMode && newRefreshMode != null) {
throw new ValidationException("Changing of REFRESH MODE is unsupported");
}

return changes;
};
}

final Map<String, String> oldOptions = oldTable.getOptions();
final Map<String, String> newOptions = mergeContext.getMergedTableOptions();
private List<TableChange> getDistributionTableChanges(
final MergeContext mergeContext, final ResolvedCatalogMaterializedTable oldTable) {
final TableDistribution oldDistribution = oldTable.getDistribution().orElse(null);
final TableDistribution newDistribution =
mergeContext.getMergedTableDistribution().orElse(null);
if (!Objects.equals(oldDistribution, newDistribution)) {
if (oldDistribution == null) {
return List.of(TableChange.add(newDistribution));
} else if (newDistribution == null) {
return List.of(TableChange.dropDistribution());
} else {
return List.of(TableChange.modify(newDistribution));
}
}
return List.of();
}

private List<TableChange> getOptionsTableChanges(
final MergeContext mergeContext, final ResolvedCatalogMaterializedTable oldTable) {
final List<TableChange> changes = new ArrayList<>();
final Map<String, String> oldOptions = oldTable.getOptions();
final Map<String, String> newOptions = mergeContext.getMergedTableOptions();

for (Map.Entry<String, String> newOptionEntry : newOptions.entrySet()) {
for (Map.Entry<String, String> newOptionEntry : newOptions.entrySet()) {
if (!newOptionEntry.getValue().equals(oldOptions.get(newOptionEntry.getKey()))) {
changes.add(TableChange.set(newOptionEntry.getKey(), newOptionEntry.getValue()));
}
}

for (Map.Entry<String, String> oldOptionEntry : oldOptions.entrySet()) {
if (newOptions.get(oldOptionEntry.getKey()) == null) {
changes.add(TableChange.reset(oldOptionEntry.getKey()));
}
for (Map.Entry<String, String> oldOptionEntry : oldOptions.entrySet()) {
if (newOptions.get(oldOptionEntry.getKey()) == null) {
changes.add(TableChange.reset(oldOptionEntry.getKey()));
}
}
return changes;
}

final RefreshMode oldRefreshMode = oldTable.getRefreshMode();
final RefreshMode newRefreshMode = mergeContext.getMergedRefreshMode();
if (oldRefreshMode != newRefreshMode && newRefreshMode != null) {
throw new ValidationException("Changing of REFRESH MODE is unsupported");
private List<TableChange> getQueryTableChanges(
final MergeContext mergeContext, final ResolvedCatalogMaterializedTable oldTable) {
final String originalQuery = oldTable.getOriginalQuery();
final String expandedQuery = oldTable.getExpandedQuery();
if (!originalQuery.equals(mergeContext.getMergedOriginalQuery())
|| !expandedQuery.equals(mergeContext.getMergedExpandedQuery())) {
return List.of(
TableChange.modifyDefinitionQuery(
mergeContext.getMergedOriginalQuery(),
mergeContext.getMergedExpandedQuery()));
}
return List.of();
}

private List<TableChange> getSchemaTableChanges(
final MergeContext mergeContext,
final SchemaResolver schemaResolver,
final ResolvedCatalogMaterializedTable oldTable) {
final ResolvedSchema oldSchema = oldTable.getResolvedSchema();
final ResolvedSchema newSchema = schemaResolver.resolve(mergeContext.getMergedSchema());
final List<TableChange> changes =
new ArrayList<>(
MaterializedTableUtils.validateAndExtractColumnChanges(
oldSchema, newSchema, mergeContext.hasSchemaDefinition()));

final UniqueConstraint oldConstraint = oldSchema.getPrimaryKey().orElse(null);
final UniqueConstraint newConstraint = newSchema.getPrimaryKey().orElse(null);
if (!Objects.equals(oldConstraint, newConstraint)) {
if (newConstraint == null) {
changes.add(TableChange.dropConstraint(oldConstraint.getName()));
} else if (oldConstraint == null) {
changes.add(TableChange.add(newConstraint));
} else {
changes.add(TableChange.modify(newConstraint));
}
}

final TableDistribution oldDistribution = oldTable.getDistribution().orElse(null);
final TableDistribution newDistribution =
mergeContext.getMergedTableDistribution().orElse(null);
if (!Objects.equals(oldDistribution, newDistribution)) {
if (oldDistribution == null) {
changes.add(TableChange.add(newDistribution));
} else if (newDistribution == null) {
changes.add(TableChange.dropDistribution());
} else {
changes.add(TableChange.modify(newDistribution));
}
final WatermarkSpec oldWatermarkSpec =
oldSchema.getWatermarkSpecs().isEmpty()
? null
: oldSchema.getWatermarkSpecs().get(0);
final WatermarkSpec newWatermarkSpec =
newSchema.getWatermarkSpecs().isEmpty()
? null
: newSchema.getWatermarkSpecs().get(0);
if (!Objects.equals(oldWatermarkSpec, newWatermarkSpec)) {
if (newWatermarkSpec == null) {
changes.add(TableChange.dropWatermark());
} else if (oldWatermarkSpec == null) {
changes.add(TableChange.add(newWatermarkSpec));
} else {
changes.add(TableChange.modify(newWatermarkSpec));
}
}

return changes;
};
return changes;
}

@Override
Expand Down
43 changes: 29 additions & 14 deletions ...le-planner/src/main/java/org/apache/flink/table/planner/utils/MaterializedTableUtils.java
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,7 @@
import org.apache.flink.table.catalog.TableChange.ColumnPosition;
import org.apache.flink.table.planner.operations.PlannerQueryOperation;
import org.apache.flink.table.planner.operations.converters.SqlNodeConverter.ConvertContext;
import org.apache.flink.table.types.logical.utils.LogicalTypeCasts;

import org.apache.calcite.sql.SqlIntervalLiteral;
import org.apache.calcite.sql.SqlIntervalLiteral.IntervalValue;
Expand Down Expand Up @@ -278,7 +279,7 @@ private static void applyMetadataColumnChanges(
}
}

public static List<Column> validateAndExtractNewColumns(
public static List<TableChange> validateAndExtractColumnChanges(
ResolvedSchema oldSchema, ResolvedSchema newSchema, boolean schemaDefinedInQuery) {
final List<Column> newColumns = getPersistedColumns(newSchema);
final List<Column> oldColumns = getPersistedColumns(oldSchema);
Expand All @@ -294,29 +295,43 @@ public static List<Column> validateAndExtractNewColumns(
originalColumnSize, newColumnSize));
}

final List<TableChange> columnChanges = new ArrayList<>();
for (int i = 0; i < oldColumns.size(); i++) {
Column oldColumn = oldColumns.get(i);
Column newColumn = newColumns.get(i);
Column newColumn =
schemaDefinedInQuery
? newColumns.get(i)
: newColumns.get(i).copy(newColumns.get(i).getDataType().nullable());
if (!oldColumn.equals(newColumn)) {
throw new ValidationException(
String.format(
"When modifying the query of a materialized table, "
+ "currently only support appending columns at the end of original schema, dropping, renaming, and reordering columns are not supported.\n"
+ "Column mismatch at position %d: Original column is [%s], but new column is [%s].",
i, oldColumn, newColumn));
if (!oldColumn.getName().equals(newColumn.getName())
|| !LogicalTypeCasts.supportsImplicitCast(
oldColumn.getDataType().getLogicalType(),
newColumn.getDataType().getLogicalType())) {
Comment on lines +306 to +309
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@raminqaf raminqaf Mar 23, 2026

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What happens here if we change we change the type of the column here? From CHAR(1) -> CHAR(4)

throw new ValidationException(
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@AHeise AHeise Mar 23, 2026

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Can we move the exception also to the operation and just issue a TableChange.ModifyPhysicalColumnType?

String.format(
"When modifying the query of a materialized table, "
+ "currently only support appending columns at the end of original schema, dropping, renaming, and reordering columns are not supported.\n"
+ "Column mismatch at position %d: Original column is [%s], but new column is [%s].",
i + 1, oldColumn, newColumn));
}
if (!Objects.equals(oldColumn.getComment(), newColumn.getComment())) {
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@AHeise AHeise Mar 23, 2026

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Since we often treat comment = '' == comment = null, shall we normalize here? Wrap comments in some StringUtil.emptyIfNull.

columnChanges.add(
TableChange.modifyColumnComment(
oldColumn, newColumn.getComment().orElse(null)));
}
}
}

final List<Column> newAddedColumns = new ArrayList<>();
for (int i = oldColumns.size(); i < newColumns.size(); i++) {
Column newColumn = newColumns.get(i);
newAddedColumns.add(
schemaDefinedInQuery
? newColumn
: newColumn.copy(newColumn.getDataType().nullable()));
columnChanges.add(
TableChange.add(
schemaDefinedInQuery
? newColumn
: newColumn.copy(newColumn.getDataType().nullable())));
}

return newAddedColumns;
return columnChanges;
}

public static ResolvedSchema getQueryOperationResolvedSchema(
Expand Down
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