xtern commented on code in PR #2105:
URL: https://github.com/apache/ignite-3/pull/2105#discussion_r1217769560
##########
modules/catalog/src/main/java/org/apache/ignite/internal/catalog/CatalogServiceImpl.java:
##########
@@ -321,6 +341,89 @@ public CompletableFuture<Void>
dropColumn(AlterTableDropColumnParams params) {
});
}
+ /** {@inheritDoc} */
+ @Override
+ public CompletableFuture<Void> alterColumn(AlterColumnParams params) {
+ return saveUpdate(catalog -> {
+ String schemaName =
Objects.requireNonNullElse(params.schemaName(), CatalogService.PUBLIC);
+
+ SchemaDescriptor schema =
Objects.requireNonNull(catalog.schema(schemaName), "No schema found: " +
schemaName);
+
+ TableDescriptor table = schema.table(params.tableName());
+
+ if (table == null) {
+ throw new TableNotFoundException(schemaName,
params.tableName());
+ }
+
+ String columnName = params.columnName();
+
+ Optional<TableColumnDescriptor> source =
table.columns().stream().filter(desc ->
desc.name().equals(columnName)).findFirst();
+
+ if (source.isEmpty()) {
+ throw new ColumnNotFoundException(columnName);
+ }
+
+ TableColumnDescriptor origin = source.get();
+
+ if (table.isPrimaryKeyColumn(origin.name())) {
+ if (params.notNull() != null) {
+ throwUnsupportedDdl("Cannot change NOT NULL for the
primary key column '{}'.", origin.name());
+ }
+
+ if (params.type() != null) {
+ throwUnsupportedDdl("Cannot change data type for primary
key column '{}'.", origin.name());
+ }
+ }
+
+ boolean nullable = !Objects.requireNonNullElse(params.notNull(),
!origin.nullable());
+ DefaultValue defaultValue =
Objects.requireNonNullElse(params.defaultValue(origin.type()),
origin.defaultValue());
+ ColumnType type = Objects.requireNonNullElse(params.type(),
origin.type());
+ int scale = Objects.requireNonNullElse(params.scale(),
origin.scale());
+
+ boolean varLenType = type == ColumnType.STRING || type ==
ColumnType.BYTE_ARRAY;
+ int precision = varLenType ? origin.precision() :
Objects.requireNonNullElse(params.precision(), origin.precision());
+ int length = varLenType ?
Objects.requireNonNullElse(params.precision(), origin.length()) :
origin.length();
Review Comment:
> Why do you ignore precision and length from params?
Currently I don't have length in params. After parsing we have RelDataType,
which doesn't have a length.
But since there is a length in the TableColumnDescriptor - for
VARCHAR/VARBINARY precision is used as the length.
If you think this is the wrong place for this transformation, I can add
length to the params and set it earlier, when converting, WDYT?
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