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--- calc_lookup_table_intersection [2013/07/18 19:52]
admin [Notes]
+++ calc_lookup_table_intersection [2026/08/28 03:11] (current)
hermann Sync from local documentation review
@@ Line 1: / Line 1: @@
 ====== Calc Lookup Table Intersection ======
 ===== Description =====
-This functor calculates a lookup table that is the intersection of two lookup tables.
+Calculates the lookup table that is the intersection of two lookup tables.
 ===== Inputs =====
-^ Name          ^ Type                                  ^ Description               ^
+^ Name  ^ Type  ^ Description  ^
-| First Table   | [[Lookup Table Type|Lookup Table  ]]  | The first lookup table.   |
+| First Table  | [[Lookup Table Type]]  | The first lookup table.  |
-| Second Table  | [[Lookup Table Type|Lookup Table  ]]  | The second lookup table.  |
+| Second Table  | [[Lookup Table Type]]  | The second lookup table.  |
 ===== Optional Inputs =====
-^ Name                                     ^ Type                  ^ Description                                                                                                                               ^ Default Value ^
+^ Name  ^ Type  ^ Description  ^ Default Value  ^
-| use First Table To Solve Duplicated Key  | [[Bool Type|Bool  ]]  | If true, in the case of duplicated keys, the value of the first table is selected; otherwise, the value of the second table is selected.  | True          |
+| Use First Table To Solve Duplicated Key  | [[Boolean Value Type]]  | If true, and a key occurs in both tables, the value from First Table is kept; if false, the value from Second Table is kept instead.  | True  |
-===== Output =====
+===== Outputs =====
-^ Name     ^ Type                                  ^ Description                  ^
+^ Name  ^ Type  ^ Description  ^
-| result   | [[Lookup Table Type|Lookup Table  ]]  | The resulting lookup table.  |
+| Result  | [[Lookup Table Type]]  | The resulting lookup table, containing only the keys present in both First Table and Second Table.  |
 ===== Group =====
-[[Functor List#Table | Table]]
+[[Functor List#Lookup Table | Lookup Table]]
 ===== Notes =====
-The column names from the first input table are assigned to the output table.
+The key and value column names of Result are inherited from First Table.
+For background on this operation, see [[https://en.wikipedia.org/wiki/Intersection_(set_theory)|set intersection]].
-For further information about set intersection, see [[wp>Set_intersection]].
 ===== Internal Name =====
 CalcLookupTableIntersection