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| author | Wenchen Fan <wenchen@databricks.com> | 2016-10-11 20:27:08 -0700 |
|---|---|---|
| committer | gatorsmile <gatorsmile@gmail.com> | 2016-10-11 20:27:08 -0700 |
| commit | b9a147181d5e38d9abed0c7215f4c5cb695f579c (patch) | |
| tree | e2c3bda2b680a67b914b2fc737bbafb0350efb93 /bin | |
| parent | 5b77e66dd6a128c5992ab3bde418613f84be7009 (diff) | |
| download | spark-b9a147181d5e38d9abed0c7215f4c5cb695f579c.tar.gz spark-b9a147181d5e38d9abed0c7215f4c5cb695f579c.tar.bz2 spark-b9a147181d5e38d9abed0c7215f4c5cb695f579c.zip | |
[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.
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