Wenchen Fan b9a147181d [SPARK-17720][SQL] introduce static SQL conf ... ## What changes were proposed in this pull request? SQLConf is session-scoped and mutable. However, we do have the requirement for a static SQL conf, which is global and immutable, e.g. the `schemaStringThreshold` in `HiveExternalCatalog`, the flag to enable/disable hive support, the global temp view database in https://github.com/apache/spark/pull/14897. Actually we've already implemented static SQL conf implicitly via `SparkConf`, this PR just make it explicit and expose it to users, so that they can see the config value via SQL command or `SparkSession.conf`, and forbid users to set/unset static SQL conf. ## How was this patch tested? new tests in SQLConfSuite Author: Wenchen Fan <wenchen@databricks.com> Closes #15295 from cloud-fan/global-conf.		2016-10-11 20:27:08 -07:00
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inst	[SPARK-17720][SQL] introduce static SQL conf	2016-10-11 20:27:08 -07:00
R	[SPARK-17665][SPARKR] Support options/mode all for read/write APIs and options in other types	2016-10-07 11:34:49 -07:00
src-native	[SPARK-6811] Copy SparkR lib in make-distribution.sh	2015-05-23 00:04:01 -07:00
tests	[SPARK-12034][SPARKR] Eliminate warnings in SparkR test cases.	2015-12-07 10:38:17 -08:00
vignettes	[SPARKR][DOC] minor formatting and output cleanup for R vignettes	2016-10-04 09:22:26 -07:00
.lintr	[SPARK-12327][SPARKR] fix code for lintr warning for commented code	2016-01-03 20:53:35 +05:30
.Rbuildignore	[SPARK-16507][SPARKR] Add a CRAN checker, fix Rd aliases	2016-07-16 17:06:44 -07:00
DESCRIPTION	[SPARK-16581][SPARKR] Make JVM backend calling functions public	2016-08-29 12:55:32 -07:00
NAMESPACE	[SPARK-17577][SPARKR][CORE] SparkR support add files to Spark job and get by executors	2016-09-21 20:08:28 -07:00