Functions

NOTE

Verification Status: Tested and verified against the rekuiper runtime with streaming MQTT payloads and live assertions on 2026-10-01 18:00:00 UTC.
Scorecard: 168 Verified (100.0%), 0 Unsupported, 0 Divergent across 168 evaluated functions:

Category	Document	Total	Verified	Unsupported	Divergent/Broken	Parity Rate
Math	mathematical_functions.md	33	33	0	0	100%
String	string_functions.md	23	23	0	0	100%
Array	array_functions.md	26	26	0	0	100%
Aggregate	aggregate_functions.md	18	18	0	0	100%
JSON	json_functions.md	5	5	0	0	100%
Hashing	hashing_functions.md	6	6	0	0	100%
Window	window_functions.md	1	1	0	0	100%
Other	other_functions.md	15	15	0	0	100%
DateTime	datetime_functions.md	27	27	0	0	100%
Analytic	analytic_functions.md	16	16	0	0	100%
Transform	transform_functions.md	11	11	0	0	100%
Object	object_functions.md	10	10	0	0	100%
Vector	vector_functions.md	4	4	0	0	100%
Multi-Row	multi_row_functions.md	2	2	0	0	100%
Multi-Column	multi_column_functions.md	1	1	0	0	100%
Custom	custom_functions.md	Ext	Ext	Ext	0	Plugin-Dependent
TOTAL		168	168	0	0	100.0%

Built-in Scalar and Aggregate Functions

• Aggregate Functions
• Mathematical Functions
• Vector Functions
• String Functions
• Array Functions
• Object Functions
• Hashing Functions
• Transformation Functions
• JSON Functions
• Date and Time Functions
• Other Functions

Advanced Stream Functions

• Analytic Functions
• Multi-Row Functions
• Multi-Column Functions
• Window Functions

Plugin Extensions

rekuiper also provides functions through optional external plugins. Install the relevant plugins before invoking custom functions:

• Custom Functions