* move google ext docs from contrib to core

* fix links

* revert unintended change

* more links, add note to example ext doc that it was removed, unlink from sidebar

* make sure intervals are required

* all truncated values everywhere

* continue to spec when going from tasks table

* remove unused thigns

* fix alert

* Move router/indexer config/API docs to main pages

* Restore missing properties, fix typo

* Use sentence casing

* Fix broken link

* Check targetCompactionSizeBytes to search for candidate segments in auto compaction

* fix logs

* add javadoc

* rename

* Fix dependency analyze warnings

Update the maven dependency plugin to the latest version and fix all
warnings for unused declared and used undeclared dependencies in the
compile scope. Added new travis job to add the check to CI. Also fixed
some source code files to use the correct packages for their imports and
updated druid-forbidden-apis to prevent regressions.

* Address review comments

* Adjust scope for org.glassfish.jaxb:jaxb-runtime

* Fix dependencies for hdfs-storage

* Consolidate netty4 versions

* Exit JVM on curator unhandled errors

If an unhandled error occurs when curator is talking to ZooKeeper, exit
the JVM in addition to stopping the lifecycle to prevent the process
from being left in a zombie state. With this change,
BoundedExponentialBackoffRetryWithQuit is no longer needed as when
curator exceeds the configured retries, it triggers its unhandled error
listeners. A new "connectionTimeoutMs" CuratorConfig setting is added
mostly to facilitate testing curator unhandled errors, but it may be
useful for users as well.

* Address review comments

* Suppress index-out-of-bounds warning from LGTM about loop unrolling

* Remove space

* Patch comments

* Fix result of division may be truncated

* Refactoring

* Patch comments

* update DimensionDictionarySelector.getValueCardinality() javadoc

* unknown cardinality in StringDictionaryEncodedColumn dim selector

* revert StringDictionaryEncodedColumn change as that fails GroupBy-v1 execution for many working queries

* fix/add more comments

* disallow whitespace characters in data source names

* wrapped preconditions in a function, and simplify unit tests code

* Fixed regex to allow space, simplified repeat logic

* Fixed import style against mvn checkstyle

* Add msg in case test fails, use emptyMap(), improved naming

* Changes on assertion functions

* change wording of "whitespace" to "whitespace except space" to avoid misleading

* fix datasource name guessing

* fix comment

* Add realization for updating version of derived segments in MaterializedView

* add unit test, and change code style for the sake of ease of understanding

* fix document's mistake of expression

* Speed up StringDimensionIndexer.estimateEncodedKeyComponentSize

* Remove print

* Move benchmark, add header

* Fix inconsistent equals and hashCode

* Patch comments

* Remove equals and hashCode from InsensitiveContainsSearchQuerySpec

* fixing ingest spec

* rm console.log

* ingest segment spec

* make sure step query always being run

* better example interface

* add keywords

* placeholders

* do not overwrite datasource name in data loader spec

* fix comment typo

Changelog at:
https://orc.apache.org/docs/releases.html#current-release---156

* Add realization for updating version of derived segments in MaterializedView

* add unit test, and change code style for the sake of ease of understanding

* fix "gunzip -k" to "gunzip -c"

* set encoding for license and notice scripts, split generate-license.py into generate-binary-license.py and check-licenses.py, check-licenses when -Papache-release is used

* missing docs

* doc fix

* more doc fix

* remove comments

* good catch travis +1

* fix lgtm alerts

* fix log tailing

* update snapshots

* increase test-coverage

* fix ordered inputs

* fixes

* prettier fix

* fixes

* enable unit tests with JDK11

This enables unit tests with openjdk11, splitting up the build into
stages to have it fail faster

The integration test docker image still uses openjdk8, so there is
little reason to run those tests with JDK11 yet

* remove stages

* Use Codecov

Upload coverage reports to Codecov. For now, having Codecov comment on
PRs or enforcing a minimum coverage threshold are both disabled until
the Codecov coverage reports look reliable:
https://codecov.io/gh/apache/incubator-druid

* Split bash and curl into separate lines