Exception when using register as temp view if label has hyphens

[alexjbush]

The behaviour for labels when using either the SQL action or debugAsTable is currently incorrect as it will allow you to create a label with hyphens.

Expected Behavior

Two options:

1. Prevent any labels being created that contain hyphens
2. Warn users if the label they choose will fail when using SQL-based actions

Actual Behavior

When using the following action and debugAsTable you get the following error:

.openFileCSV("/path/to/my/files/*.csv", "my-new-label", Map("header" -> "true")) 

//Exception:
org.apache.spark.sql.AnalysisException: Invalid view name: my-new-label;

Doing this on plain Spark gets the same exception when registering the temp views:

scala> val res = spark.read.parquet("...")
res: org.apache.spark.sql.DataFrame = [... 122 more fields]

scala> res.createOrReplaceTempView("people-ww")
org.apache.spark.sql.AnalysisException: Invalid view name: people-ww;
  at org.apache.spark.sql.Dataset.org$apache$spark$sql$Dataset$$createTempViewCommand(Dataset.scala:2687)
  at org.apache.spark.sql.Dataset$$anonfun$createOrReplaceTempView$1.apply(Dataset.scala:2640)
  at org.apache.spark.sql.Dataset$$anonfun$createOrReplaceTempView$1.apply(Dataset.scala:2640)
  at org.apache.spark.sql.Dataset.org$apache$spark$sql$Dataset$$withPlan(Dataset.scala:2872)
  at org.apache.spark.sql.Dataset.createOrReplaceTempView(Dataset.scala:2639)
  ... 48 elided

Specifications

• Spark Version: 1.5.1
• Waimak Module: waimak-core