Fix the INTERVAL object operator on a form: the module fails to load with an internal error

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
55/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
java
Domain
backend

Research direction

The payload gives no source file or test path; start by searching the platform sources for the INTERVAL operator and the NF COLLECTION RESTARTED error, then trace the form property parsing path. Reproduce the supplied FORM f example with dryRun and compare it with a working property. Done means the form loads and displays the interval, with range editing when both objects are in a panel.

Written by the indexing model from the issue text.

Description

bug
Description

Adding the INTERVAL object operator for a pair of date objects to a form makes the whole logic fail to load — not with a semantic error but with an internal exception reported at the PROPERTIES line:

FORM f
    OBJECTS dates = (d1 = DATE, d2 = DATE) PANEL
    PROPERTIES period 'Period' = INTERVAL(d1, d2)
;
// Error during parsing at f:3:4
// java.lang.RuntimeException: NF COLLECTION RESTARTED

Every variant fails the same way: with or without PANEL, with or without an alias and caption, as the first property of the form or after other properties, in its own PROPERTIES statement or together with other groups' properties. Reproduced with dryRun on 7.0-SNAPSHOT (the 2026-10-18 build and the current master sources).

Reason

The operator is documented (Interactive_view, Properties_and_actions_block) as the way to get an editable date-range picker for a pair of panel objects, and it cannot be used at all: the only workaround is two VALUE() properties, which loses the range picker.

Fix

A form with INTERVAL(d1, d2) loads, shows the interval between the two objects and, when both are in a panel, lets the user edit it as a date range, as documented.

Dominant language
Java
Stars
214
Forks
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