Handles both column-based clauses (<clause><column/></clause>) and
expression-based predicates (<expression op=...>) found in TWB XML.
Value
A tibble with columns:
- join_type
Join kind (e.g.,
inner,left), if available.- left_table
Left table name (cleaned).
- left_field
Left field name.
- operator
Predicate operator (defaults to
"="when missing).- right_table
Right table name (cleaned).
- right_field
Right field name.
Examples
twb <- system.file("extdata", "test_for_wenjie.twb", package = "twbparser")
stopifnot(nzchar(twb), file.exists(twb))
xml <- xml2::read_xml(twb)
extract_joins(xml)
#> # A tibble: 0 × 6
#> # ℹ 6 variables: join_type <chr>, left_table <chr>, left_field <chr>,
#> # operator <chr>, right_table <chr>, right_field <chr>