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DRILL-7254: Read Hive union w/o nulls

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    ./src/main/codegen/templates/UnionVectorListWriter.java
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    ./src/main/codegen/templates/UnionVectorWriter.java
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DRILL-7373: Fix problems involving reading from DICT type

- Fixed FieldIdUtil to resolve reading from DICT for some complex cases;

- optimized reading from DICT given a key by passing an appropriate Object type to DictReader#find(...) and DictReader#read(...) methods when schema is known (e.g. when reading from Hive tables) instead of generating it on fly based on int or String path and key type;

- fixed error when accessing value by not existing key value in Avro table.

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

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DRILL-7252: Read Hive map using Dict<K,V> vector

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DRILL-7168: Implement ALTER SCHEMA ADD / REMOVE commands

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DRILL-7350: Move RowSet related classes from test folder

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DRILL-7341: Vector reAlloc may fail after exchange

closes #1838

DRILL-7337: Add vararg UDFs support

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    ./src/main/codegen/templates/HolderReaderImpl.java
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DRILL-7332: Allow parsing empty schema

closes #1828

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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-7315: Revise precision and scale order in the method arguments

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    ./src/main/codegen/templates/ComplexReaders.java
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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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    ./src/main/codegen/templates/ComplexCopier.java
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DRILL-7310: Move schema-related classes from exec module to be able to use them in metastore module

closes #1816

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DRILL-7306: Disable schema-only batch for new scan framework

The EVF framework is set up to return a "fast schema" empty batch

with only schema as its first batch because, when the code was

written, it seemed that's how we wanted operators to work. However,

DRILL-7305 notes that many operators cannot handle empty batches.

Since the empty-batch bugs show that Drill does not, in fact,

provide a "fast schema" batch, this ticket asks to disable the

feature in the new scan framework. The feature is disabled with

a config option; it can be re-enabled if ever it is needed.

SQL differentiates between two subtle cases, and both are

supported by this change.

1. Empty results: the query found a schema, but no rows

are returned. If no reader returns any rows, but at

least one reader provides a schema, then the scan

returns an empty batch with the schema.

2. Null results: the query found no schema or rows. No

schema is returned. If no reader returns rows or

schema, then the scan returns no batch: it instead

immediately returns a DONE status.

For CSV, an empty file with headers returns the null result set

(because we don't know the schema.) An empty CSV file without headers

returns an empty result set because we do know the schema: it will

always be the columns array.

Old tests validate the original schema-batch mode, new tests

added to validate the no-schema-batch mode.

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DRILL-7253: Read Hive struct w/o nulls

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    ./src/main/codegen/templates/HolderReaderImpl.java
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DRILL-6951: Merge row set based mock data source

The mock data source is used in several tests to generate a large volume

of sample data, such as when testing spilling. The mock data source also

lets us try new plugin featues in a very simple context. During the

development of the row set framework, the mock data source was converted

to use the new framework to verify functionality. This commit upgrades

the mock data source with that work.

The work changes non of the functionality. It does, however, improve

memory usage. Batchs are limited, by default, to 10 MB in size. The row

set framework minimizes internal fragmentation in the largest vector.

(Previously, internal fragmentation averaged 25% but could be as high as

50%.)

As it turns out, the hash aggregate tests depended on the internal

fragmentation: without it, the hash agg no longer spilled for the same

row count. Adjusted the generated row counts to recreate a data volume

that caused spilling.

One test in particular always failed due to assertions in the hash agg

code. These seem true bugs and are described in DRILL-7301. After

multiple failed attempts to get the test to work, it ws disabled until

DRILL-7301 is fixed.

Added a new unit test to sanity check the mock data source. (No test

already existed for this functionality except as verified via other unit

tests.)

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DRILL-7293: Convert the regex ("log") plugin to use EVF

Converts the log format plugin (which uses a regex for parsing) to work

with the Extended Vector Format.

User-visible behavior changes added to the README file.

* Use the plugin config object to pass config to the Easy framework.

* Use the EVF scan mechanism in place of the legacy "ScanBatch"

mechanism.

* Minor code and README cleanup.

* Replace ad-hoc type conversion with builtin conversions

The provided schema support in the enhanced vector framework (EVF)

provides automatic conversions from VARCHAR to most types. The log

format plugin was created before EVF was available and provided its own

conversion mechanism. This commit removes the ad-hoc conversion code and

instead uses the log plugin config schema information to create an

"output schema" just as if it was provided by the provided schema

framework.

Because we need the schema in the plugin (rather than the reader), moved

the schema-parsing code out of the reader into the plugin. The plugin

creates two schemas: an "output schema" with the desired output types,

and a "reader schema" that uses only VARCHAR. This causes the EVF to

perform conversions.

* Enable provided schema support

Allows the user to specify types using either the format config (as

previously) or a provided schema. If a schema is provided, it will match

columns using names specified in the format config.

The provided schema can specify both types and modes (nullable or not

null.)

If a schema is provided, then the types specified in the plugin config

are ignored. No attempt is made to merge schemas.

If a schema is provided, but a column is omitted from the schema, the

type defaults to VARCHAR.

* Added ability to specify regex in table properties

Allows the user to specify the regex, and the column schema,

using a CREATE SCHEMA statement. The README file provides the details.

Unit tests demonstrate and verify the functionality.

* Used the custom error context provided by EVF to enhance the log format

reader error messages.

* Added user name to default EVF error context

* Added support for table functions

Can set the regex and maxErrors fields, but not the schema.

Schema will default to "field_0", "field_1", etc. of type

VARCHAR.

* Added unit tests to verify the functionality.

* Added a check, and a test, for a regex with no groups.

* Added columns array support

When the log regex plugin is given no schema, it previously

created a list of columns "field_0", "field_1", etc. After

this change, the plugin instead follows the pattern set by

the text plugin: it will place all fields into the columns

array. (The two special fields are still separate.)

A few adjustments were necessary to the columns array

framework to allow use of the special columns along with

the `columns` column.

Modified unit tests and the README to reflect this change.

The change should be backward compatible because few users

are likely relying on the dummy field names.

Added unit tests to verify that schema-based table

functions work. A test shows that, due to the unforunate

config property name "schema", users of this plugin cannot

combine a config table function with the schema attribute

in the way promised in DRILL-6965.

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DRILL-7258: Remove field width limit for text reader

The V2 text reader enforced a limit of 64K characters when using

column headers, but not when using the columns[] array. The V3 reader

enforced the 64K limit in both cases.

This patch removes the limit in both cases. The limit now is the

16MB vector size limit. With headers, no one column can exceed 16MB.

With the columns[] array, no one row can exceed 16MB. (The 16MB

limit is set by the Netty memory allocator.)

Added an "appendBytes()" method to the scalar column writer which adds

additional bytes to those already written for a specific column or

array element value. The method is implemented for VarChar, Var16Char

and VarBinary vectors. It throws an exception for all other types.

When used with a type conversion shim, the appendBytes() method throws

an exception. This should be OK because, the previous setBytes() should

have failed because a huge value is not acceptable for numeric or date

types conversions.

Added unit tests of the append feature, and for the append feature in

the batch overflow case (when appending bytes causes the vector or

batch to overflow.) Also added tests to verify the lack of column width

limit with the text reader, both with and without headers.

closes #1802

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    ./src/main/codegen/templates/ColumnAccessors.java
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DRILL-7279: Enable provided schema for text files without headers

* Allows a provided schema for text files without headers. The

provided schema columns replace the `columns` column that is

normally used.

* Allows customizing text format properties using table properties.

The table properties "override" properties set in the plugin config.

* Added unit tests for the newly supported use cases.

* Fixed bug in quote escape handling.

closes #1798

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DRILL-7278: Refactor result set loader projection mechanism

Drill 1.16 added a enhanced scan framework based on the row set

mechanisms, and a "provisioned schema" feature build on top

of that framework. Conversion of the log reader plugin to use

the framework identified additional features we wish to add,

such as marking a column as "special" (not expanded in a wildcard

query.)

This work identified that the code added for provisioned schemas in

Drill 1.16 worked, but is a bit overly complex, making it hard to add

the desired new feature.

This patch refactors the "reader" projection code:

* Create a "projection set" mechanism that the reader can query to ask,

"the caller just added a column. Should it be projected or not?"

* Unifies the type conversion mechanism added as part of provisioned

schemas.

* Added the "special column" property for both "reader" and "provided"

schemas.

* Verified that provisioned schemas work with maps (at least on the scan

framework side.)

* Replaced the previous "schema transformer" mechanism with a new "type

conversion" mechanism that unifies type conversion, provided schemas

and an optional custom type conversion mechanism.

* Column writers can report if they are projected. Moved this query

from metadata to the column writer itself.

* Extended and clarified documentation of the feature.

* Revised and/or added unit tests.

closes #1797

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DRILL-7257: Set nullable var-width vector lastSet value

Turns out this is due to a subtle issue with variable-width nullable

vectors. Such vectors have a lastSet attribute in the Mutator class.

When using "transfer pairs" to copy values, the code somehow decides

to zero-fill from the lastSet value to the record count. The row set

framework did not set this value, meaning that the RemovingRecordBatch

zero-filled the dir0 column when it chose to use transfer pairs rather

than copying values. The use of transfer pairs occurs when all rows in

a batch pass the filter prior to the removing record batch.

Modified the nullable vector writer to properly set the lastSet value at

the end of each batch. Added a unit test to verify the value is set

correctly.

Includes a bit of code clean-up.

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DRILL-7181: Improve V3 text reader (row set) error messages

Adds an error context to the User Error mechanism. The context allows

information to be passed through an intermediate layer and applied when

errors are raised in lower-level code; without the need for that

low-level code to know the details of the error context information.

Modifies the scan framework and V3 text plugin to use the framework to

improve error messages.

Refines how the `columns` column can be used with the text reader. If

headers are used, then `columns` is just another column. An error is

raised, however, if `columns[x]` is used when headers are enabled.

Added another builder abstraction where a constructor argument list

became too long.

Added the drill file system and split to the file schema negotiator

to simplify reader construction.

Added additional unit tests to fully define the `columns` column

behavior.

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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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[maven-release-plugin] prepare for next development iteration

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[maven-release-plugin] prepare release drill-1.16.0

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[maven-release-plugin] prepare release drill-1.16.0

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DRILL-7188: Revert DRILL-6642: Update protocol-buffers version

1. Updated protobuf to version 3.6.1

2. Added protobuf to the root pom dependency management

3. Added classes BoundedByteString and LiteralByteString for compatibility with HBase

4. Added ProtobufPatcher to provide compatibility with MapR-DB and HBase

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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-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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    ./src/main/codegen/templates/ColumnAccessors.java
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DRILL-7096: Develop vector for canonical Map<K,V>

- Added new type DICT;

- Created value vectors for the type for single and repeated modes;

- Implemented corresponding FieldReaders and FieldWriters;

- Made changes in EvaluationVisitor to be able to read values from the map by key;

- Made changes to DrillParquetGroupConverter to be able to read Parquet's MAP type;

- Added an option `store.parquet.reader.enable_map_support` to disable reading MAP type as DICT from Parquet files;

- Updated AvroRecordReader to use new DICT type for Avro's MAP;

- Added support of the new type to ParquetRecordWriter.

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    ./src/main/codegen/includes/vv_imports.ftl
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    ./src/main/codegen/templates/BasicTypeHelper.java
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    ./src/main/codegen/templates/ComplexCopier.java
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    ./src/main/codegen/templates/ComplexReaders.java
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    ./src/main/codegen/templates/MapWriters.java
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    ./src/main/codegen/templates/RepeatedDictWriter.java
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