paul-rogers commented on a change in pull request #2026: DRILL-7330: Implement
metadata usage for all format plugins
URL: https://github.com/apache/drill/pull/2026#discussion_r394696569
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/store/dfs/easy/EasyGroupScan.java
##########
@@ -333,21 +338,73 @@ public boolean canPushdownProjects(List<SchemaPath>
columns) {
}
@JsonProperty
+ @JsonIgnore(value = false)
public TupleMetadata getSchema() {
return getTableMetadata().getSchema();
}
@Override
- @JsonIgnore
- public TableMetadata getTableMetadata() {
- if (tableMetadata == null) {
- tableMetadata = metadataProvider.getTableMetadata();
+ public AnalyzeInfoProvider getAnalyzeInfoProvider() {
+ return new AnalyzeFileInfoProviderImpl(formatPlugin.getName());
+ }
+
+ @Override
+ protected GroupScanWithMetadataFilterer<?> getFilterer() {
+ return new EasyGroupScanFilterer(this);
+ }
+
+ @Override
+ protected FileTableMetadataProviderBuilder<?>
tableMetadataProviderBuilder(MetadataProviderManager source) {
+ if (source.usesMetastore()) {
+ return new
MetastoreFileTableMetadataProvider.Builder<>((MetastoreMetadataProviderManager)
source);
+ } else {
+ return defaultTableMetadataProviderBuilder(source);
}
- return tableMetadata;
}
@Override
- public TableMetadataProvider getMetadataProvider() {
- return metadataProvider;
+ protected FileTableMetadataProviderBuilder<?>
defaultTableMetadataProviderBuilder(MetadataProviderManager source) {
+ return new SimpleFileTableMetadataProvider.Builder(source);
+ }
+
+ /**
+ * Implementation of GroupScanWithMetadataFilterer which uses {@link
EasyGroupScan} as source and
+ * builds {@link EasyGroupScan} instance with filtered metadata.
+ */
+ private static class EasyGroupScanFilterer extends
GroupScanWithMetadataFilterer<EasyGroupScanFilterer> {
+
+ EasyGroupScanFilterer(EasyGroupScan source) {
+ super(source);
+ }
+
+ @Override
+ public AbstractGroupScanWithMetadata<?> build() {
+ EasyGroupScan newScan = new EasyGroupScan((EasyGroupScan) source);
+ newScan.tableMetadata = tableMetadata;
+ // updates common row count and nulls counts for every column
+ if (newScan.getTableMetadata() != null && files != null &&
newScan.getFilesMetadata().size() != files.size()) {
+ newScan.tableMetadata =
TableMetadataUtils.updateRowCount(newScan.getTableMetadata(), files.values());
+ }
+ newScan.partitions = partitions;
+ newScan.segments = segments;
+ newScan.files = files;
+ newScan.matchAllMetadata = matchAllMetadata;
+ newScan.nonInterestingColumnsMetadata = nonInterestingColumnsMetadata;
Review comment:
Agreed. Elsewhere, we copy the group scan by passing the new value (filters,
columns, etc.) into a constructor. Passing a half-dozen fields would be
awkward. But, passing a single `MetadataSpec` (or whatever) would be clean:
```
private MyGroupScan(MyGroupScan from, MetadataSpec mdSpec) {
this.foo = from.foo;
...
this.metadata = mdSpec;
}
public MyGroupScan newWithMetadata(MetadataSpec mdSpec) {
return new MyGroupScan(this, mdSpec);
}
```
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