Example: Function Mapping Definition with Scalar Subquery (SSQ) Substitution - Analytics Database - Teradata Vantage

SQL Data Definition Language Syntax and Examples

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Analytics Database
Teradata Vantage
Release Number
17.20
Published
June 2022
Language
English (United States)
Last Update
2024-10-04
dita:mapPath
jco1628111346878.ditamap
dita:ditavalPath
qkf1628213546010.ditaval
dita:id
mdr1472255012272
lifecycle
latest
Product Category
Teradata Vantage™

The function mapping definition sessionize_fm specifies a scalar subquery for the TIMEOUT column value:

SELECT timeout FROM ssqtbl WHERE username='John'

If TIMEOUT is not specified during function processing, the column value is resolved by processing the scalar subquery.

CREATE FUNCTION MAPPING sessionize_fm FOR sessionize SERVER coprocessor
USING
InputTable IN TABLE,
ModelTable IN TABLE,
ClusterTable OUT TABLE,
TIMECOLUMN,
TIMEOUT(SELECT timeout FROM ssqtbl WHERE username='John'),
CLICKLAG,
EMITNULL;