DRILL-6331: Revisit Hive Drill native parquet implementation to be exposed to Drill optimizations (filter / limit push down, count to direct scan)

1. Factored out common logic for Drill parquet reader and Hive Drill native parquet readers: AbstractParquetGroupScan, AbstractParquetRowGroupScan, AbstractParquetScanBatchCreator.
2. Rules that worked previously only with ParquetGroupScan, now can be applied for any class that extends AbstractParquetGroupScan: DrillFilterItemStarReWriterRule, ParquetPruneScanRule, PruneScanRule.
3. Hive populated partition values based on information returned from Hive metastore. Drill populates partition values based on path difference between selection root and actual file path.
   Before ColumnExplorer populated partition values based on Drill approach. Since now ColumnExplorer populates values for parquet files from Hive tables,
   `populateImplicitColumns` method logic was changed to populated partition columns only based on given partition values.
4. Refactored ParquetPartitionDescriptor to be responsible for populating partition values rather than storing this logic in parquet group scan class.
5. Metadata class was moved to separate metadata package (org.apache.drill.exec.store.parquet.metadata). Factored out several inner classed to improve code readability.
6. Collected all Drill native parquet reader unit tests into one class TestHiveDrillNativeParquetReader, also added new tests to cover new functionality.
7. Reduced excessive logging when parquet files metadata is read

closes #1214

1 files changed, 49 insertions, 0 deletions

diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/metadata/ParquetTableMetadataDirs.java b/exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/metadata/ParquetTableMetadataDirs.java
new file mode 100644
index 000000000..186f53415
--- /dev/null
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/metadata/ParquetTableMetadataDirs.java
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.drill.exec.store.parquet.metadata;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.util.List;
+
+public class ParquetTableMetadataDirs {
+
+  @JsonProperty
+  List<String> directories;
+
+  public ParquetTableMetadataDirs() {
+    // default constructor needed for deserialization
+  }
+
+  public ParquetTableMetadataDirs(List<String> directories) {
+    this.directories = directories;
+  }
+
+  @JsonIgnore
+  public List<String> getDirectories() {
+    return directories;
+  }
+
+  /** If directories list contains relative paths, update it to absolute ones
+   * @param baseDir base parent directory
+   */
+  @JsonIgnore public void updateRelativePaths(String baseDir) {
+    this.directories = MetadataPathUtils.convertToAbsolutePaths(directories, baseDir);
+  }
+}