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DRILL-7376: Drill ignores Hive schema for MaprDB tables when group scan has star column

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DRILL-7314: Use TupleMetadata instead of concrete implementation

1. Add ser / de implementation for TupleMetadata interface based on types.

2. Replace TupleSchema usage where possible.

3. Move patcher classes into commons.

4. Upgrade some dependencies and general refactoring.

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DRILL-7316: Move classes from org.apache.drill.metastore into org.apache.drill.exec.metastore package in java-exec module

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DRILL-7313: Use Hive schema for MaprDB native reader when field was empty

- Added all_text_mode option for hive maprDB Json

- Improved logic to convert Hive's schema into Drill's one

- Added unit tests for schema conversion

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DRILL-7150: Fix timezone conversion for timestamp from MaprDB after the transition from PDT to PST closes #1729

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DRILL-7118: Filter not getting pushed down on MapR-DB tables.

closes #1708

DRILL-7113: Fix creation of filter conditions for IS NULL and IS NOT NULL for MapR-DB format plugin

close apache/drill#1704

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DRILL-7200: Update Calcite to 1.19.0 / 1.20.0

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DRILL-5603: Replace String file paths to Hadoop Path - replaced all String path representation with org.apache.hadoop.fs.Path - added PathSerDe.Se JSON serializer - refactoring of DFSPartitionLocation code by leveraging existing listPartitionValues() functionality

closes #1657

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DRILL-6969: Fix inconsistency of reading MaprDB JSON tables using hive plugin when native reader is enabled

closes #1610

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DRILL-6870: Upgrade to ANTLR4

closes #1554

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DRILL-6691: Unify checkstyle-config.xml files.

closes #1550

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DRILL-6744: Support varchar and decimal push down

1. Added enableStringsSignedMinMax parquet format plugin config and store.parquet.reader.strings_signed_min_max session option to control reading binary statistics for files generated by prior versions of Parquet 1.10.0.

2. Added ParquetReaderConfig to store configuration needed during reading parquet statistics or files.

3. Provided mechanism to enable varchar / decimal filter push down.

4. Added VersionUtil to compare Drill versions in string representation.

5. Added appropriate unit tests.

closes #1537

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Fixed imports for DRILL-6381

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DRILL-6844: Query with ORDER BY DESC on indexed column does not pick secondary index.

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DRILL-1328: Support table statistics

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DRILL-6793: FragmentExecutor cannot send its final state for the case when RootExec root wasn't initialized

closes #1506

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DRILL-6381: Address code review comments (part 3).

DRILL-6381: Add missing joinControl logic for INTERSECT_DISTINCT.

- Modified HashJoin's probe phase to process INTERSECT_DISTINCT.

- NOTE: For build phase, the functionality will be same as for SemiJoin when it is added later.

DRILL-6381: Address code review comment for intersect_distinct.

DRILL-6381: Rebase on latest master and fix compilation issues.

DRILL-6381: Generate protobuf files for C++ native client.

DRILL-6381: Use shaded Guava classes. Add more comments and Javadoc.

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DRILL-6381: Address review comments (part 2): fix formatting issues and add javadoc.

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DRILL-6773: The renamed schema with aliases is not shown for queries on empty directories

closes #1492

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DRILL-6381: Address code review comments.

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DRILL-6824: Handle schema changes in MapRDBJsonRecordReader closes #1518

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DRILL-6724: Dump operator context to logs when error occurs during query execution

closes #1455

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DRILL-6422: Replace guava imports with shaded ones

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DRILL-6639: Exception happens while displaying operator profiles for some queries

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DRILL-6639: Exception happens while displaying operator profiles for some queries

closes #1404

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DRILL-6614: Allow usage of MapRDBFormatPlugin for HiveStoragePlugin

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DRILL-6454: Native MapR DB plugin support for Hive MapR-DB json table

closes #1314

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DRILL-6320: Fixed license headers.

closes #1207

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DRILL-6094: Decimal data type enhancements

Add ExprVisitors for VARDECIMAL

Modify writers/readers to support VARDECIMAL

- Added usage of VarDecimal for parquet, hive, maprdb, jdbc;

- Added options to store decimals as int32 and int64 or fixed_len_byte_array or binary;

Add UDFs for VARDECIMAL data type

- modify type inference rules

- remove UDFs for obsolete DECIMAL types

Enable DECIMAL data type by default

Add unit tests for DECIMAL data type

Fix mapping for NLJ when literal with non-primitive type is used in join conditions

Refresh protobuf C++ source files

Changes in C++ files

Add support for decimal logical type in Avro.

Add support for date, time and timestamp logical types.

Update Avro version to 1.8.2.

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