PARQUET_FALLBACK_SCHEMA_RESOLUTION Query Option (CDH 5.8 or higher only)
The PARQUET_FALLBACK_SCHEMA_RESOLUTION query option allows Impala to look up columns within Parquet files by column name, rather than column order, when necessary. The allowed values are:
- POSITION (0)
- NAME (1)
By default, Impala looks up columns within a Parquet file based on the order of columns in the table. The name setting for this option enables behavior for Impala queries similar to the Hive setting parquet.column.index access=false. It also allows Impala to query Parquet files created by Hive with the parquet.column.index.access=false setting in effect.
Type: integer or string
Added in: CDH 5.8.0 / Impala 2.6.0