Hadoop Hive-specific SQL limitations

Pentaho Metadata Editor

Part Number
There are a few key limitations in Hive that prevent some regular Metadata Editor features from working as intended, and limit the structure of your SQL queries in Report Designer:
  • Outer joins are not supported.
  • Each column can only be used once in a SELECT clause. Duplicate columns in SELECT statements cause errors.
  • Conditional joins can only use the = conditional unless you use a WHERE clause. Any non-equal conditional in a FROM statement forces the Metadata Editor to use a Cartesian join and a WHERE clause conditional to limit it.