Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/4015#discussion_r28745033
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala ---
@@ -130,18 +170,35 @@ class SQLContext(@transient val sparkContext:
SparkContext)
protected[sql] lazy val optimizer: Optimizer = DefaultOptimizer
@transient
- protected[sql] val ddlParser = new DDLParser(sqlParser.apply(_))
-
- @transient
- protected[sql] val sqlParser = {
- val fallback = new catalyst.SqlParser
- new SparkSQLParser(fallback(_))
+ protected[sql] val ddlParser = new DDLParser((sql: String) => {
getSQLDialect().parse(sql) })
+ protected[sql] def dialectCache = tlSession.get().dialectCache
+ protected[sql] def setDialectCache(d: Dialect) = {
+ tlSession.get().dialectCache = d
}
- protected[sql] def parseSql(sql: String): LogicalPlan = {
- ddlParser(sql, false).getOrElse(sqlParser(sql))
+ protected[sql] def getSQLDialect(): Dialect = {
+ try {
+ val clazz = Utils.classForName(dialectClassName)
+ if (dialectCache == null || dialectCache.getClass != clazz) {
+ // if the cache not exist or the Dialect class is changed
+
setDialectCache(clazz.newInstance().asInstanceOf[Dialect].initialize(conf))
+ }
+
+ dialectCache
+ } catch {
+ case t: Throwable =>
--- End diff --
`case NonFatal(e) =>`
---
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