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DRILL-7250: Query with CTE fails when its name matches to the table name without access

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DRILL-7251: Read Hive array w/o nulls

1. HiveFieldConverter replaced by Hive writers for primitives

2. Created HiveValueWriterFactory and HiveListWriter to implement arrays support

4. Readers generation replaced by HiveDefaultRecordReader and HiveTextRecordReader

5. Few reader initializers replaced by one

6. Added method to repeated vardecimal writer

7. Minor fix for array column in View

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DRILL-7196: Queries are still runnable on disabled plugins

- Storage client is not created anymore for disabled plugins

- GET "/storage/{name}.json" endpoint now working with

plugin configuration directly, without client instantination.

It have increased UI responsitivity.

- Hbase and mongo base test classes refactored to honor enabled

plugin attribute

- Fixed path contructor for mongo test datasets:

Now it is cross-platform

- Fixed test json files format which using plugin definitions

- Code cleanup

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    ./resources/agg/hashagg/q7_1.json
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    ./resources/agg/hashagg/q7_2.json
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    ./resources/agg/hashagg/q7_3.json
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    ./resources/agg/hashagg/q8_1.json
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    ./resources/common/test_hashtable1.json
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    ./resources/decimal/cast_decimal_int.json
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    ./resources/decimal/cast_decimal_vardecimal.json
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    ./resources/decimal/cast_int_decimal.json
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    ./resources/decimal/cast_simple_decimal.json
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    ./resources/decimal/cast_vardecimal_decimal.json
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DRILL-7242: Handle additional boundary cases and compute better estimates when popular values span multiple buckets.

Address review comments.

close apache/drill#1785

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DRILL-7237: Fix single_value aggregate function for variable length types

- Add implementations of single_value for complex data types

closes #1782

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    ./java/org/apache/drill/PlanTestBase.java
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    ./java/org/apache/drill/TestExampleQueries.java
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DRILL-4782 / DRILL-7139: Fix DATE_ADD and TO_TIME functions

- cast function for the day interval changed to round milliseconds to complete days

- ToDateTypeFunctions#toTime now returning milliseconds of day

- updated the way how DayInterval subtracts and adds, to follow the cast function logic

UT core updates:

- added vectorValue function to the queryBuilder to simplify retrieving value of the vector

- refactored singleton query result functions at queryBuilder

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    ./java/org/apache/drill/test/QueryBuilder.java
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DRILL-7238: Fixed ConvertCountToDirectScan to handle non-existent columns

closes #1781

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DRILL-7227: Fix predicate check in DrillRelOptUtil.analyzeSimpleEquiJoin

closes #1775

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DRILL-7225: Fixed merging ColumnTypeInfo for files with different schemas closes #1773

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DRILL-7050: RexNode convert exception in sub-query closes #1770

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    ./java/org/apache/drill/TestCorrelation.java
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    ./java/org/apache/drill/exec/sql/TestCTTAS.java
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DRILL-7187: Improve selectivity estimation of BETWEEN predicates and arbitrary combination of range predicates.

Address review comments.

Modify unit test expected rowcount after rebasing.

close apache/drill#1772

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DRILL-7164: KafkaFilterPushdownTest is sometimes failing to pattern match correctly

closes #1760

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    ./java/org/apache/drill/PlanTestBase.java
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DRILL-7183: TPCDS query 10, 35, 69 take longer with sf 1000 when Statistics are disabled. This commit reverts the changes done for DRILL-6997.

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DRILL-6988. Utility of the too long error message when syntax error

- Adding Drill wrapper around SqlparseException to customize produced by Calcite messages

- Fix Drill SQL parse exception formatter to calculate proper position for "^" character

closes #1753

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DRILL-6974: SET option command modification

- ALTER ... RESET ... and ALTER ... SET ... sub-parsers separated to 2

different SqlCall classes with same parent SqlSetOption

- parserImpls modified to handle new syntax of ALTER... SET...

expresion:

a) ALTER ... SET option.name - option.value - setting option value

b) ALTER ... SET option.name - display option value

- Handler for SqlSetOption separated to SetOptionHandler and

ResetOptionhandler for better representation of handled statements

- Base abstract class AbstractSqlSetHandler created to not repeat

shared implementation of same functions

- SetOptionHandler covered with unit tests for each statement

form.

Fix issues stated in the review

closes #1763

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DRILL-7167: Implemented DESCRIBE TABLE statement

- altered parser implementation to honor DESCRIBE TABLE syntax

- extended test coverage to check the new statement

closes #1747

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DRILL-7171: Create metadata directories cache file in the leaf level directories to support ConvertCountToDirectScan optimization. closes #1748

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DRILL-7166: Count query with wildcard should skip reading of metadata summary file

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DRILL-7159: Fix typeString method to return correct name for MAP (aka STRUCT) closes #1741

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DRILL-7049: REST API returns the toString of byte arrays (VARBINARY types)

closes #1739

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DRILL-7152: During histogram creation handle the case when all values of a column are NULLs.

close apache/drill#1730

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DRILL-7045: Updates to address review comments

closes #7134

DRILL-7146: Query failing with NPE when ZK queue is enabled.

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DRILL-7143: Support default value for empty columns

Modifies the prior work to add default values for columns. The prior work added defaults

when the entire column is missing from a reader (the old Nullable Int column). The Row

Set mechanism now will also "fill empty" slots with the default value.

Added default support for the column writers. The writers automatically obtain the

default value from the column schema. The default can also be set explicitly on

the column writer.

Updated the null column mechanism to use this feature rather than the ad-hoc

implemention in the prior commit.

Semantics changed a bit. Only Required columns take a default. The default value

is ignored or nullable columns since nullable columns already have a file default: NULL.

Other changes:

* Updated the CSV-with-schema tests to illustrate the new behavior.

* Made multiple fixes for Boolean and Decimal columns and added unit tests.

* Upgraded Fremarker to version 2.3.28 to allow use of the continue statement.

* Reimplemented the Bit column reader and writer to use the BitVector directly since this vector is rather special.

* Added get/set Boolean methods for column accessors

* Moved the BooleanType class to the common package

* Added more CSV unit tests to explore decimal types, booleans, and defaults

* Add special handling for blank fields in from-string conversions

* Added options to the conversion factory to specify blank-handling behavior.

CSV uses a mapping of blanks to null (nullable) or default value (non-nullable)

closes #1726

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    ./java/org/apache/drill/test/ClusterTest.java
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    ./java/org/apache/drill/test/rowSet/test/TestDummyWriter.java
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DRILL-7140: RM: Drillbits fail with "No enum constant org.apache.drill.exec.resourcemgr.config.selectionpolicy.QueueSelectionPolicy.SelectionPolicy.bestfit"

closes #1720

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DRILL-7138: Implement command to describe schema for table

closes #1719

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    ./java/org/apache/drill/TestSchemaCommands.java
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DRILL-7062: Initial implementation of run-time rowgroup pruning closes #1738

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DRILL-7064: Leverage the summary metadata for plain COUNT aggregates.

Add unit test

Modify MetadataDirectGroupScan to track summary file information and use in unit test.

Conflicts:

exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/metadata/Metadata.java

exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/metadata/Metadata_V4.java

Fix NPE for DrillTable to account for non-eligible tables.

Fix bug with direct scan after directory pruning. Add unit test.

Address review comments.

closes #1736

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DRILL-7076: Fix NPE in StatsMaterializationVisitor

closes #1722

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DRILL-7032: Ignore corrupt rows in a PCAP file

closes #1637

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    ./resources/store/pcap/testv1.pcap
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