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Detect Changes Between Tag Sets

Source: R/tag_helpers.R
detect_tag_changes.Rd

Compares two tag sets and returns TRUE if they differ. Used for cascade reset logic to determine if downstream state should be invalidated.

Usage

detect_tag_changes(old_tags, new_tags)

Arguments

old_tags

Named list of previous tags (can be NULL for first apply)

new_tags

Named list of new tags

Value

Logical: TRUE if tags changed, FALSE if identical

Details

Per D-10/D-11, this enables independent cascade resets. The function handles:

  • NULL old_tags (first application, always returns TRUE)

  • Different number of tags

  • Different column names

  • Different tag values

Examples

# First apply (NULL -> new) - returns TRUE
detect_tag_changes(NULL, list(col1 = "Name"))
#> [1] TRUE

# Same tags - returns FALSE
detect_tag_changes(list(col1 = "Name"), list(col1 = "Name"))
#> [1] FALSE

# Changed value - returns TRUE
detect_tag_changes(list(col1 = "Name"), list(col1 = "CASRN"))
#> [1] TRUE