ERROR: only immutable functions supported in continuous aggregate view

Hi List,

I'm trying to create a TimescaleDB continuous aggregate using the
following statement:

CREATE MATERIALIZED VIEW "navigation_data_5min_hidden" WITH
(timescaledb.continuous) AS
SELECT
  public.time_bucket(INTERVAL '5 min', "time") AS "time",
  "context",
  jsonb_build_object(
    'max', max("value"::double precision) FILTER (WHERE "path" =
'navigation.courseOverGroundTrue'),
    'min', min("value"::double precision) FILTER (WHERE "path" =
'navigation.courseOverGroundTrue'),
    'mode', mode() WITHIN GROUP (ORDER BY "value") FILTER (WHERE "path"
= 'navigation.courseOverGroundTrue' AND "value" IS NOT NULL),
    'cardinality', COUNT(DISTINCT "value") FILTER (WHERE "path" =
'navigation.courseOverGroundTrue' AND "value" IS NOT NULL),
    'average', public.average(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.courseOverGroundTrue')),
    'integral', public.average(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.courseOverGroundTrue')) * EXTRACT(EPOCH FROM INTERVAL '5 min'),
    'stddev', public.stddev(public.stats_agg("value"::double precision)
FILTER (WHERE "path" = 'navigation.courseOverGroundTrue')),
    'skewness', public.skewness(public.stats_agg("value"::double
precision) FILTER (WHERE "path" = 'navigation.courseOverGroundTrue')),
    'first_time', public.first_time(public.time_weight('Linear',
"time", "value"::double precision) FILTER (WHERE "path" =
'navigation.courseOverGroundTrue')),
    'first_val', public.first_val(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.courseOverGroundTrue')),
    'last_time', public.last_time(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.courseOverGroundTrue')),
    'last_val', public.last_val(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.courseOverGroundTrue'))
  ) AS "navigation.courseOverGroundTrue",
  jsonb_build_object(
    'mode', mode() WITHIN GROUP (ORDER BY "value") FILTER (WHERE "path"
= 'navigation.datetime' AND "value" IS NOT NULL),
    'cardinality', COUNT(DISTINCT "value") FILTER (WHERE "path" =
'navigation.datetime' AND "value" IS NOT NULL),
    'first_time', public.first("time", "time") FILTER (WHERE "path" =
'navigation.datetime' AND "time" IS NOT NULL),
    'first_val', public.first("value"#>>'{}', "time") FILTER (WHERE
"path" = 'navigation.datetime' AND "time" IS NOT NULL),
    'last_time', public.last("time", "time") FILTER (WHERE "path" =
'navigation.datetime' AND "time" IS NOT NULL),
    'last_val', public.last("value"#>>'{}', "time") FILTER (WHERE
"path" = 'navigation.datetime' AND "time" IS NOT NULL)
  ) AS "navigation.datetime",
  jsonb_build_object(
    'mode', mode() WITHIN GROUP (ORDER BY "value") FILTER (WHERE "path"
= 'navigation.gnss.methodQuality' AND "value" IS NOT NULL),
    'cardinality', COUNT(DISTINCT "value") FILTER (WHERE "path" =
'navigation.gnss.methodQuality' AND "value" IS NOT NULL),
    'first_time', public.first("time", "time") FILTER (WHERE "path" =
'navigation.gnss.methodQuality' AND "time" IS NOT NULL),
    'first_val', public.first("value"#>>'{}', "time") FILTER (WHERE
"path" = 'navigation.gnss.methodQuality' AND "time" IS NOT NULL),
    'last_time', public.last("time", "time") FILTER (WHERE "path" =
'navigation.gnss.methodQuality' AND "time" IS NOT NULL),
    'last_val', public.last("value"#>>'{}', "time") FILTER (WHERE
"path" = 'navigation.gnss.methodQuality' AND "time" IS NOT NULL)
  ) AS "navigation.gnss.methodQuality",
  jsonb_build_object(
    'max', max("value"::double precision) FILTER (WHERE "path" =
'navigation.gnss.satellites'),
    'min', min("value"::double precision) FILTER (WHERE "path" =
'navigation.gnss.satellites'),
    'mode', mode() WITHIN GROUP (ORDER BY "value") FILTER (WHERE "path"
= 'navigation.gnss.satellites' AND "value" IS NOT NULL),
    'cardinality', COUNT(DISTINCT "value") FILTER (WHERE "path" =
'navigation.gnss.satellites' AND "value" IS NOT NULL),
    'average', public.average(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.gnss.satellites')),
    'integral', public.average(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.gnss.satellites')) * EXTRACT(EPOCH FROM INTERVAL '5 min'),
    'stddev', public.stddev(public.stats_agg("value"::double precision)
FILTER (WHERE "path" = 'navigation.gnss.satellites')),
    'skewness', public.skewness(public.stats_agg("value"::double
precision) FILTER (WHERE "path" = 'navigation.gnss.satellites')),
    'first_time', public.first_time(public.time_weight('Linear',
"time", "value"::double precision) FILTER (WHERE "path" =
'navigation.gnss.satellites')),
    'first_val', public.first_val(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.gnss.satellites')),
    'last_time', public.last_time(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.gnss.satellites')),
    'last_val', public.last_val(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.gnss.satellites'))
  ) AS "navigation.gnss.satellites",
  jsonb_build_object(
    'mode', mode() WITHIN GROUP (ORDER BY "value") FILTER (WHERE "path"
= 'navigation.gnss.type' AND "value" IS NOT NULL),
    'cardinality', COUNT(DISTINCT "value") FILTER (WHERE "path" =
'navigation.gnss.type' AND "value" IS NOT NULL),
    'first_time', public.first("time", "time") FILTER (WHERE "path" =
'navigation.gnss.type' AND "time" IS NOT NULL),
    'first_val', public.first("value"#>>'{}', "time") FILTER (WHERE
"path" = 'navigation.gnss.type' AND "time" IS NOT NULL),
    'last_time', public.last("time", "time") FILTER (WHERE "path" =
'navigation.gnss.type' AND "time" IS NOT NULL),
    'last_val', public.last("value"#>>'{}', "time") FILTER (WHERE
"path" = 'navigation.gnss.type' AND "time" IS NOT NULL)
  ) AS "navigation.gnss.type",
  jsonb_build_object(
    'max', max("value"::double precision) FILTER (WHERE "path" =
'navigation.headingTrue'),
    'min', min("value"::double precision) FILTER (WHERE "path" =
'navigation.headingTrue'),
    'mode', mode() WITHIN GROUP (ORDER BY "value") FILTER (WHERE "path"
= 'navigation.headingTrue' AND "value" IS NOT NULL),
    'cardinality', COUNT(DISTINCT "value") FILTER (WHERE "path" =
'navigation.headingTrue' AND "value" IS NOT NULL),
    'average', public.average(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.headingTrue')),
    'integral', public.average(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.headingTrue')) * EXTRACT(EPOCH FROM INTERVAL '5 min'),
    'stddev', public.stddev(public.stats_agg("value"::double precision)
FILTER (WHERE "path" = 'navigation.headingTrue')),
    'skewness', public.skewness(public.stats_agg("value"::double
precision) FILTER (WHERE "path" = 'navigation.headingTrue')),
    'first_time', public.first_time(public.time_weight('Linear',
"time", "value"::double precision) FILTER (WHERE "path" =
'navigation.headingTrue')),
    'first_val', public.first_val(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.headingTrue')),
    'last_time', public.last_time(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.headingTrue')),
    'last_val', public.last_val(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" = 'navigation.headingTrue'))
  ) AS "navigation.headingTrue",
  jsonb_build_object(
    'mode', mode() WITHIN GROUP (ORDER BY "value") FILTER (WHERE "path"
= 'navigation.position' AND "value" IS NOT NULL),
    'cardinality', COUNT(DISTINCT "value") FILTER (WHERE "path" =
'navigation.position' AND "value" IS NOT NULL),
    'first_time', public.first("time", "time") FILTER (WHERE "path" =
'navigation.position' AND "time" IS NOT NULL),
    'first_val', public.first("value"#>>'{}', "time") FILTER (WHERE
"path" = 'navigation.position' AND "time" IS NOT NULL),
    'last_time', public.last("time", "time") FILTER (WHERE "path" =
'navigation.position' AND "time" IS NOT NULL),
    'last_val', public.last("value"#>>'{}', "time") FILTER (WHERE
"path" = 'navigation.position' AND "time" IS NOT NULL)
  ) AS "navigation.position",
  jsonb_build_object(
    'max', max("value"::double precision) FILTER (WHERE "path" =
'navigation.rateOfTurn'),
    'min', min("value"::double precision) FILTER (WHERE "path" =
'navigation.rateOfTurn'),
    'mode', mode() WITHIN GROUP (ORDER BY "value") FILTER (WHERE "path"
= 'navigation.rateOfTurn' AND "value" IS NOT NULL),
    'cardinality', COUNT(DISTINCT "value") FILTER (WHERE "path" =
'navigation.rateOfTurn' AND "value" IS NOT NULL),
    'average', public.average(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" = 'navigation.rateOfTurn')),
    'integral', public.average(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.rateOfTurn')) * EXTRACT(EPOCH FROM INTERVAL '5 min'),
    'stddev', public.stddev(public.stats_agg("value"::double precision)
FILTER (WHERE "path" = 'navigation.rateOfTurn')),
    'skewness', public.skewness(public.stats_agg("value"::double
precision) FILTER (WHERE "path" = 'navigation.rateOfTurn')),
    'first_time', public.first_time(public.time_weight('Linear',
"time", "value"::double precision) FILTER (WHERE "path" =
'navigation.rateOfTurn')),
    'first_val', public.first_val(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" = 'navigation.rateOfTurn')),
    'last_time', public.last_time(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" = 'navigation.rateOfTurn')),
    'last_val', public.last_val(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" = 'navigation.rateOfTurn'))
  ) AS "navigation.rateOfTurn",
  jsonb_build_object(
    'max', max("value"::double precision) FILTER (WHERE "path" =
'navigation.speedOverGround'),
    'min', min("value"::double precision) FILTER (WHERE "path" =
'navigation.speedOverGround'),
    'mode', mode() WITHIN GROUP (ORDER BY "value") FILTER (WHERE "path"
= 'navigation.speedOverGround' AND "value" IS NOT NULL),
    'cardinality', COUNT(DISTINCT "value") FILTER (WHERE "path" =
'navigation.speedOverGround' AND "value" IS NOT NULL),
    'average', public.average(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.speedOverGround')),
    'integral', public.average(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.speedOverGround')) * EXTRACT(EPOCH FROM INTERVAL '5 min'),
    'stddev', public.stddev(public.stats_agg("value"::double precision)
FILTER (WHERE "path" = 'navigation.speedOverGround')),
    'skewness', public.skewness(public.stats_agg("value"::double
precision) FILTER (WHERE "path" = 'navigation.speedOverGround')),
    'first_time', public.first_time(public.time_weight('Linear',
"time", "value"::double precision) FILTER (WHERE "path" =
'navigation.speedOverGround')),
    'first_val', public.first_val(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.speedOverGround')),
    'last_time', public.last_time(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.speedOverGround')),
    'last_val', public.last_val(public.time_weight('Linear', "time",
"value"::double precision) FILTER (WHERE "path" =
'navigation.speedOverGround'))
  ) AS "navigation.speedOverGround",
  jsonb_build_object(
    'mode', mode() WITHIN GROUP (ORDER BY "value") FILTER (WHERE "path"
= 'navigation.state' AND "value" IS NOT NULL),
    'cardinality', COUNT(DISTINCT "value") FILTER (WHERE "path" =
'navigation.state' AND "value" IS NOT NULL),
    'first_time', public.first("time", "time") FILTER (WHERE "path" =
'navigation.state' AND "time" IS NOT NULL),
    'first_val', public.first("value"#>>'{}', "time") FILTER (WHERE
"path" = 'navigation.state' AND "time" IS NOT NULL),
    'last_time', public.last("time", "time") FILTER (WHERE "path" =
'navigation.state' AND "time" IS NOT NULL),
    'last_val', public.last("value"#>>'{}', "time") FILTER (WHERE
"path" = 'navigation.state' AND "time" IS NOT NULL)
  ) AS "navigation.state"
FROM
    "gosk"."mapped_data"
WHERE
    "path" IN (
        'navigation.courseOverGroundTrue',
        'navigation.datetime',
        'navigation.gnss.methodQuality',
        'navigation.gnss.satellites',
        'navigation.gnss.type',
        'navigation.headingTrue',
        'navigation.position',
        'navigation.rateOfTurn',
        'navigation.speedOverGround',
        'navigation.state'
    )
GROUP BY
    1, 2
WITH NO DATA;

And that results in an error:

ERROR:  only immutable functions supported in continuous aggregate view
HINT:  Make sure all functions in the continuous aggregate definition
have IMMUTABLE volatility. Note that functions or expressions may be
IMMUTABLE for one data type, but STABLE or VOLATILE for another.

The error is caused by the jsonb_build_object function, is there any
reason why this function is not IMMUTABLE? I would have expected it to
be IMMUTABLE.

Kind regards,

Martijn de Munnik