[GitHub] [drill] vvysotskyi commented on a change in pull request #2026: DRILL-7330: Implement metadata usage for all format plugins

[GitBox]

vvysotskyi 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_r395124840
 
 

 ##########
 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:
   Yes, we have constructors with too many arguments, the most of the fields, 
set here aren't passed into the constructor, they either calculated when 
calling the corresponding method or assigned in the same way as in this code. 
Introducing a holder for them might make code more complicated.

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