wuwenchi commented on code in PR #4625:
URL: https://github.com/apache/iceberg/pull/4625#discussion_r865682252
##########
flink/v1.14/flink/src/main/java/org/apache/iceberg/flink/FlinkSchemaUtil.java:
##########
@@ -172,4 +217,110 @@ public static TableSchema toSchema(Schema schema) {
return builder.build();
}
+
+
+ /**
+ * Convert a {@link Schema} to a {@link Schema}.
+ *
+ * @param schema iceberg schema to convert.
+ * @return Flink Schema.
+ */
+ public static org.apache.flink.table.api.Schema toSchema(Schema schema,
Map<String, String> properties) {
+
+ org.apache.flink.table.api.Schema.Builder builder =
org.apache.flink.table.api.Schema.newBuilder();
+
+ // get watermark and computed columns
+ Map<String, String> watermarkMap = Maps.newHashMap();
+ Map<String, String> computedColumnsMap = Maps.newHashMap();
+ properties.keySet().stream()
+ .filter(k -> k.startsWith(FLINK_PREFIX) && properties.get(k) != null)
+ .forEach(k -> {
+ final String name = k.substring(k.lastIndexOf('.') + 1);
+ String expr = properties.get(k);
+ if (k.startsWith(WATERMARK_PREFIX)) {
+ watermarkMap.put(name, expr);
+ } else if (k.startsWith(COMPUTED_COLUMNS_PREFIX)) {
+ computedColumnsMap.put(name, expr);
+ }
+ });
+
+ // add physical columns.
+ for (RowType.RowField field : convert(schema).getFields()) {
+ builder.column(field.getName(),
TypeConversions.fromLogicalToDataType(field.getType()));
+ }
+
+ // add computed columns.
+ computedColumnsMap.forEach(builder::columnByExpression);
+
+ // add watermarks.
+ watermarkMap.forEach(builder::watermark);
+
+ // add primary key.
+ List<String> primaryKey = getPrimaryKeyFromSchema(schema);
+ if (!primaryKey.isEmpty()) {
+ builder.primaryKey(primaryKey.toArray(new String[0]));
+ }
+
+ return builder.build();
+ }
+
+ /**
+ * Convert a {@link CatalogTable} to a {@link ResolvedSchema}.
+ *
+ * @param table flink unresolved schema to convert.
+ * @return Flink ResolvedSchema.
+ */
+ public static ResolvedSchema convertToResolvedSchema(CatalogTable table) {
+ StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment(new Configuration());
+ StreamTableEnvironment streamTableEnvironment =
StreamTableEnvironment.create(env);
+ CatalogManager catalogManager = ((TableEnvironmentImpl)
streamTableEnvironment).getCatalogManager();
+ SchemaResolver schemaResolver = catalogManager.getSchemaResolver();
+ return table.getUnresolvedSchema().resolve(schemaResolver);
Review Comment:
This method is indeed better!
But the description is taken from the table's comment:
```
@Override
public Optional<String> getDescription() {
return Optional.of(getComment());
}
```
The comment does not necessarily exist, and if it exists, it is not
necessarily the path of the table, so `tableEnvironment.from` may not be able
to get the table...
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