EC
3236
MariaDBERRORNotableGIS / SpatialHIGH confidence

SRID mismatch in spatial aggregation function

Production Risk

Medium — aggregation fails; data migration may be required.

Why it happens
  1. 1Spatial aggregation function (e.g., ST_Collect) received geometries with different SRIDs.
  2. 2Aggregating rows where spatial column contains mixed SRIDs.
How to reproduce
trigger — this will error
trigger — this will error
SELECT ST_Collect(geom_col) FROM t1; -- geom_col has rows with SRID 4326 and 3857

expected output

ERROR 3236 (HY000): SRID mismatch found in aggregation.

Fix 1

Ensure all rows use the same SRID

Ensure all rows use the same SRID
UPDATE t1 SET geom_col = ST_Transform(geom_col, 4326) WHERE ST_SRID(geom_col) != 4326;

Why this works

Standardizing SRID across all rows allows aggregation to succeed.

Fix 2

Filter to rows with matching SRID before aggregation

Filter to rows with matching SRID before aggregation
SELECT ST_Collect(geom_col) FROM t1 WHERE ST_SRID(geom_col) = 4326;

Why this works

Aggregate only rows with consistent SRID.

What not to do

✕

Sources
Official documentation ↗

MySQL 8.0 — 3236 ER_GIS_DIFFERENT_SRIDS_AGGREGATION

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