Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/12104#discussion_r58426294
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/InMemoryCatalog.scala
---
@@ -48,7 +48,7 @@ class InMemoryCatalog extends ExternalCatalog {
private val catalog = new scala.collection.mutable.HashMap[String,
DatabaseDesc]
private def filterPattern(names: Seq[String], pattern: String):
Seq[String] = {
- val regex = pattern.replaceAll("\\*", ".*").r
+ val regex = pattern.replaceAll("\\.\\*", "\\*").replaceAll("\\*",
"\\.\\*").r
--- End diff --
Looks like Hive's doc does not really match its implementation. I also took
a look at postgres
(http://www.postgresql.org/docs/9.1/static/app-psql.html#APP-PSQL-PATTERNS) and
impala
(http://www.cloudera.com/documentation/archive/impala/2-x/2-1-x/topics/impala_show.html#show_functions_unique_1).
`*` will be interpreted as `.*` in regex. Also, looking at our current
implementation, we do not really have a super clear syntax for the pattern. I
feel it will be better to decide the syntax first and then make the change.
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