YannByron commented on code in PR #5201:
URL: https://github.com/apache/hudi/pull/5201#discussion_r849280513
##########
hudi-common/src/main/java/org/apache/hudi/common/table/TableSchemaResolver.java:
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@@ -159,23 +167,67 @@ public Schema getTableAvroSchema() throws Exception {
* @throws Exception
*/
public Schema getTableAvroSchema(boolean includeMetadataFields) throws
Exception {
+ Schema schema;
Option<Schema> schemaFromCommitMetadata =
getTableSchemaFromCommitMetadata(includeMetadataFields);
if (schemaFromCommitMetadata.isPresent()) {
- return schemaFromCommitMetadata.get();
- }
- Option<Schema> schemaFromTableConfig =
metaClient.getTableConfig().getTableCreateSchema();
- if (schemaFromTableConfig.isPresent()) {
- if (includeMetadataFields) {
- return HoodieAvroUtils.addMetadataFields(schemaFromTableConfig.get(),
hasOperationField);
+ schema = schemaFromCommitMetadata.get();
+ } else {
+ Option<Schema> schemaFromTableConfig =
metaClient.getTableConfig().getTableCreateSchema();
+ if (schemaFromTableConfig.isPresent()) {
+ if (includeMetadataFields) {
+ schema =
HoodieAvroUtils.addMetadataFields(schemaFromTableConfig.get(),
hasOperationField);
+ } else {
+ schema = schemaFromTableConfig.get();
+ }
} else {
- return schemaFromTableConfig.get();
+ if (includeMetadataFields) {
+ schema = getTableAvroSchemaFromDataFile();
+ } else {
+ schema =
HoodieAvroUtils.removeMetadataFields(getTableAvroSchemaFromDataFile());
+ }
}
}
- if (includeMetadataFields) {
- return getTableAvroSchemaFromDataFile();
- } else {
- return
HoodieAvroUtils.removeMetadataFields(getTableAvroSchemaFromDataFile());
+
+ Option<String[]> partitionFieldsOpt =
metaClient.getTableConfig().getPartitionFields();
+ if (metaClient.getTableConfig().isDropPartitionColumns()) {
+ schema = recreateSchemaWhenDropPartitionColumns(partitionFieldsOpt,
schema);
+ }
+ return schema;
+ }
+
+ public static Schema recreateSchemaWhenDropPartitionColumns(Option<String[]>
partitionFieldsOpt, Schema originSchema) {
+ // when hoodie.datasource.write.drop.partition.columns is true, partition
columns can't be persisted in data files.
+ // And there are no partition schema if the schema is parsed from data
files.
+ // Here we create partition Fields for this case, and use StringType as
the data type.
+ Schema schema = originSchema;
+ if (partitionFieldsOpt.isPresent() && partitionFieldsOpt.get().length !=
0) {
+ List<String> partitionFields = Arrays.asList(partitionFieldsOpt.get());
+
+ final Schema schema0 = originSchema;
+ boolean hasPartitionColNotInSchema = partitionFields.stream().anyMatch(
+ pt -> !HoodieAvroUtils.containsFieldInSchema(schema0, pt)
+ );
+ boolean hasPartitionColInSchema = partitionFields.stream().anyMatch(
+ pt -> HoodieAvroUtils.containsFieldInSchema(schema0, pt)
+ );
+ if (hasPartitionColNotInSchema && hasPartitionColInSchema) {
+ throw new HoodieIncompatibleSchemaException(
+ "Not support: Partial partition fields are still in the schema "
+ + "when enable
hoodie.datasource.write.drop.partition.columns");
+ }
+
+ if (hasPartitionColNotInSchema) {
+ // when hasPartitionColNotInSchema is true and hasPartitionColInSchema
is false, all partition columns
+ // are not in originSchema. So we create and add them.
+ List<Field> newFields = new ArrayList<>();
+ for (String partitionField: partitionFields) {
+ newFields.add(new Schema.Field(
+ partitionField, Schema.create(Schema.Type.STRING), "",
JsonProperties.NULL_VALUE));
Review Comment:
in some cases, the schema is out-of-date in hoodie.properties, even there is
no schema stored in hoodie.properties.
I prefer to have a unified place to manage the latest schema, rather than
the current logical that get schema from metadata, hoodie.properties, datafile
in order.
Like deltalake and iceberg do.
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