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DRILL-7072: Query with semi join fails for JDBC storage plugin closes #1674

DRILL-7069: Moved version checks outside loops in transformBinaryInMetadataCache closes #1667

DRILL-7063: Seperate metadata cache file into summary, file metadata

closes #1723

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DRILL-7068: Support memory adjustment framework for resource management with Queues. closes #1677

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Fix few issues with the poweredBy page

Add description to the poweredby page

Add text formatting

DRILL-7047: Drill C++ Client crash due to Dangling stack ptr to sasl_callback_t closes #1661

DRILL-7035: Drill C++ Client crashes on multiple SaslAuthenticatorImpl destruction due to communication error closes #1660

DRILL-7041: CompileException happens if a nested coalesce function returns null - Made `NullExpression`s in `IfExpression` with nested `IfExpression`s to be rewritten to typed ones recursively if necessary closes #1668

Adding powered by page with initial set of companies

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DRILL-7056: Drill fails with NPE when starting in distributed mode & 31010 port is used closes #1656

DRILL-6927: Avoid double conversion from impala timestamp when hive native parquet reader is used closes #1655

DRILL-6952: Host compliant text reader on the row set framework

The result set loader allows controlling batch sizes. The new scan framework

built on top of that framework handles projection, implicit columns, null

columns and more. This commit converts the "new" ("compliant") text reader

to use the new framework. Options select the use of the V2 ("new") or V3

(row-set based) versions. Unit tests demonstrate V3 functionality.

closes #1683

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DRILL-7052: Relative path for URL redirection

DRILL-7036: Improve UI for alert and error messages closes #1644 This PR standardizes error and alert messages to a cleaner interface by leveraging Bootstraps UX elements for publishing the messages in a presentable format. Exceptions reported back to the browser and rendered in a neat tabular format (using Panels) All errors can be redirected to errorMessage.ftl which will render it in a neat format. Alerts are replaced with modals. Interactions (pages) affected by Alert modals 1. Missing Query submission 2. profile Query Rerun 3. invalid Profile Listing Fetch 4. invalid Option Value for update 5. Missing username/password submission

The errorMessage.ftl has been moved to root dir, and unused `error.ftl` was removed

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DRILL-7200: Update Calcite to 1.19.0 / 1.20.0

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DRILL-7049 return VARBINARY as a string with escaped non printable bytes

DRILL-7045 UDF string_binary java.lang.IndexOutOfBoundsException

UDF string_binary was not reallocating the drillbuffer so it would fill

up and throw and out of bounds exception

edit convert_from example to show correct results

DRILL-7070: Fix deb and rpm issues on apache drill master branch

The Apache Drill failed to generate debian and rpm packages. The issues fixed as below,

-Add apache as prefix

-Remove lib folder while packaging, because lib folder does not exist.

-Add git.properties, KEYS, LICENSE, NOTICE, README.md and sample-data dir into the /opt/drill/.

-Update plugin version to 2.2.0

-Update Maven org.vafer:jdeb plugin version to 1.7

-Change the rpm name tobe generated by editing version, and name.

-Remove two files under distribution/src/deb/control/ i.e. conffiles and control.

-The `<copyright>` tag isn't supported anymore for this plugin. Hence use `<license>` and project variables content instead of `2013 ASF`.

Signed-off-by: Naresh Bhat <naresh.bhat@linaro.org>

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DRILL-6855: Do not load schema if there is an IOException

closes #1626

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-6582: SYSLOG (RFC-5424) Format Plugin closes #1530

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DRILL-6734: JDBC storage plugin returns null for fields without aliases closes #1642 - Add output column names to JdbcRecordReader and use them for storing the results since column names in result set may differ when aliases aren't specified

DRILL-4858: REPEATED_COUNT on an array of maps and an array of arrays is not implemented

- Implemented 'repeated_count' function for repeated MAP and repeated LIST;

- Updated RepeatedListReader and RepeatedMapReader implementations to return correct value from size() method

- Moved repeated_count to freemarker template and added support for more repeated types for the function

closes #1641

DRILL-7117: Support creation of equi-depth histogram for selected data types.

Support int/bigint/float4/float8, time/timestamp/date and boolean.

Build the histogram from the t-digest byte array and serialize as JSON string.

More changes for serialization/deserialization.

Add code-gen stubs (empty) for VarChar/VarBinary types.

Address review comments (part 1). Add unit test.

Address review comments (part 2) for sampling.

close apache/drill#1715

change httpd storage plugin to format plugin

edit httpd page - change to format plugin vs storage

DRILL-7058: Refresh command to support subset of columns closes #1666

DRILL-7038: Queries on partitioned columns scan the entire datasets

- Added new optimizer rule which checks if query references directory columns only and has DISTINCT or GROUP BY operation. If the condition holds, instead of scanning full file set the following will be performed:

1) if there is cache metadata file, these directories will be read from it,

2) otherwise directories will be gathered from selection object (PartitionLocation).

In the end Scan node will be transformed to DrillValuesRel (containing constant literals) with gathered values so no scan will be performed.

closes #1640

DRILL-7022: Partition pruning is not happening the first time after the metadata auto-refresh

closes #1638