yuchuanchen commented on code in PR #21563:
URL: https://github.com/apache/flink/pull/21563#discussion_r1067625428
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flink-connectors/flink-connector-hive/src/main/java/org/apache/flink/connectors/hive/HiveTableSource.java:
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@@ -282,12 +296,37 @@ public void applyDynamicFiltering(List<String>
candidateFilterFields) {
@Override
public boolean supportsNestedProjection() {
- return false;
+ if (!flinkConf.get(SOURCE_NESTED_PROJECTION_PUSHDOWN_ENABLED)
+ || flinkConf.get(TABLE_EXEC_HIVE_FALLBACK_MAPRED_READER)) {
+ return false;
+ }
+ List<String> supportedFormats =
+
flinkConf.get(SOURCE_NESTED_PROJECTION_PUSHDOWN_SUPPORTED_FORMATS);
+ return supportedFormats != null
+ &&
supportedFormats.stream().anyMatch(getSerializationLib()::contains);
+ }
+
+ private String getSerializationLib() {
Review Comment:
getSerializationLib() accesses hive metastore to find out whether it is
parquet format(I didn't find another way, pls correct me if I am wrong). And
currently, only parquet format supports nested projection pushdown.
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