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DRILL-6920: Fix TestClient.testBasics() yarn test failure

closes #1582

edit semijoin option description

edit

DRILL-6919: Fix compilation error in TestGracefulShutdown class for mapr profile

doc edits

DRILL-6962: Function coalesce returns an Error when none of the columns in coalesce exist in a parquet file

- Updated UntypedNullVector to hold value count when vector is allocated and transfered to another one;

- Updated RecordBatchLoader and DrillCursor to handle case when only UntypedNull values are present in RecordBatch (special case when data buffer is null but actual values are present);

- Added functions to cast UntypedNull value to other types for use in UDFs;

- Moved UntypedReader, UntypedHolderReaderImpl and UntypedReaderImpl from org.apache.drill.exec.vector.complex.impl to org.apache.drill.exec.vector package.

closes #1614

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    /exec/java-exec/src/main/codegen/templates/CastUntypedNull.java
DRILL-6915: Disable generation of test tables with case-sensitive names for non-Linux systems

closes #1580

DRILL-6916: Fix extraneous "${project.basedir}/src/site/resources/repo/" directory appearance

- update HBase lib from 2.1.0 to 2.1.1 version (with fix for HBASE-21005)

closes #1579

edits

DRILL-6913: Fix multiple error output in the console

1. Bump up Calcite version to 1.17.0-drill-r2 (includes CALCITE-2463).

2. Optimized exception handling in DrillSqlWorker getPlan method.

closes #1578

DRILL-6912: NPE when other drillbit is already running

closes #1577

edit

add info about semi-join functionality

add config znode acl doc

add config custom znode acl doc

italicize expression remove quotes

DRILL-6879: Show warnings for potential performance issues

1. Introduced warning for non-progressive fragments. Based on a threshold (`drill.exec.http.profile.warning.progress.threshold`), if all fragments have not made progress within that time, a warning is issued. The default is 5 minutes (300 sec)

2. Introduced a warning if any of the buffered operators spill to disk.

3. Introduced a warning for operators where the longest running fragment runs beyond a minimum threshold (drill.exec.http.profile.warning.time.skew.min), and runs atleast 2 times longer than the average (drill.exec.http.profile.warning.time.skew.ratio.process). The clock symbol with a tooltip indicates the extent of the skew. For wait times, the ratio is defined by `drill.exec.http.profile.warning.time.skew.ratio.wait`

3. Introduced a warning for operators where the average wait time of a scan operator exceeds its processing time, for a minimum threshold (drill.exec.http.profile.warning.scan.wait.min). The turtle symbol with a tooltip indicates which scan operator spent more time waiting than processing.

4. TableBuilder Refactored

a. Using attribute map instead of String arguments, eg. for 'title'

b. Removed APIs that pass a hyperlink since that is never used.

closes #1572

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    /exec/java-exec/src/main/resources/rest/static/img/turtle.png
edit to format description MD-5253

edit date on querying indexes docs

add querying indexes section

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    /_docs/query-data/061-querying-indexes.md
edit to team page - add salim

add index content to docs

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    /_docs/img/query-plan-verify.png
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    /_docs/query-data/querying-indexes/021-types-of-indexes.md
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    /_docs/query-data/querying-indexes/060-verifying-index-use.md
DRILL-6907: Fix hive-exec-shaded classes recognition in IntelliJ IDEA closes #1575

team update edits for DRILL-6744

DRILL-6894: CTAS and CTTAS are not working on S3 storage when cache is disabled

- provided JsonRecordWriter, ParquetRecordWriter and DrillTextRecordWriter with file system configuration

closes #1576

DRILL-6900: maven-release-plugin failure on the release:perform stage

- downgrade maven-javadoc-plugin version

- update some Drill maven plugins versions and move them to pluginManagement block

- bump up lowest maven version supported by Drill in correspondence to org.apache.maven dependencies

closes #1574

DRILL-6901: Move schema builder to src/main

Moves the SchemaBuilder class out of the src/test name space into the src/main namespace. Specifically, into the existing record.metadata package.

Many files changed in this move. Corrected two minor issues: import of the wrong Arrays class and unnecessary annotations.

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nav pane edit due to removal of AOL data set page