Usage
view: my_view { derived_table: { table_compression: GZIP ... } }
Hierarchy
table_compression |
Default Value
GZIP
Accepts
GZIP or SNAPPY
Special Rules
table_compression is supported only on specific dialects
|
Definition
The table_compression
parameter specifies the compression that a persistent derived table (PDT) will have in an Athena database, either GZIP
or SNAPPY
.
See the Amazon Athena documentation for details.
See the Dialect Support for
table_compression
section below for the list of dialects that supporttable_compression
.
The
table_compression
parameter works only with tables that are persistent, such as PDTs and aggregate tables.table_compression
is not supported for derived tables without a persistence strategy.
Examples
Create a customer_order_facts
PDT on an Amazon Athena database with SNAPPY compression:
view: customer_order_facts {
derived_table: {
explore_source: order {
column: customer_id { field: order.customer_id }
column: date { field: order.order_time }
column: city { field: users.city }
column: age_tier { field: users.age_tier }
derived_column: num_orders {
sql: COUNT(order.customer_id) ;;
}
}
table_format: ORC
table_compression: SNAPPY
datagroup_trigger: daily_datagroup
}
}
Dialect support for table_compression
The ability to use table_compression
depends on the database dialect your Looker connection is using. In the latest release of Looker, the following dialects support table_compression
:
Dialect | Supported? |
---|---|
Actian Avalanche | No |
Amazon Athena | Yes |
Amazon Aurora MySQL | No |
Amazon Redshift | No |
Apache Druid | No |
Apache Druid 0.13+ | No |
Apache Druid 0.18+ | No |
Apache Hive 2.3+ | No |
Apache Hive 3.1.2+ | No |
Apache Spark 3+ | No |
ClickHouse | No |
Cloudera Impala 3.1+ | No |
Cloudera Impala 3.1+ with Native Driver | No |
Cloudera Impala with Native Driver | No |
DataVirtuality | No |
Databricks | No |
Denodo 7 | No |
Denodo 8 | No |
Dremio | No |
Dremio 11+ | No |
Exasol | No |
Firebolt | No |
Google BigQuery Legacy SQL | No |
Google BigQuery Standard SQL | No |
Google Cloud PostgreSQL | No |
Google Cloud SQL | No |
Google Spanner | No |
Greenplum | No |
HyperSQL | No |
IBM Netezza | No |
MariaDB | No |
Microsoft Azure PostgreSQL | No |
Microsoft Azure SQL Database | No |
Microsoft Azure Synapse Analytics | No |
Microsoft SQL Server 2008+ | No |
Microsoft SQL Server 2012+ | No |
Microsoft SQL Server 2016 | No |
Microsoft SQL Server 2017+ | No |
MongoBI | No |
MySQL | No |
MySQL 8.0.12+ | No |
Oracle | No |
Oracle ADWC | No |
PostgreSQL 9.5+ | No |
PostgreSQL pre-9.5 | No |
PrestoDB | No |
PrestoSQL | No |
SAP HANA 2+ | No |
SingleStore | No |
SingleStore 7+ | No |
Snowflake | No |
Teradata | No |
Trino | No |
Vector | No |
Vertica | No |