Changeset: ff26fe577465 for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/ff26fe577465
Modified Files:
sql/include/sql_relation.h
Branch: Mar2025
Log Message:
just comment (make the meaning of the 'semantics' and 'any' flags explicit)
diffs (14 lines):
diff --git a/sql/include/sql_relation.h b/sql/include/sql_relation.h
--- a/sql/include/sql_relation.h
+++ b/sql/include/sql_relation.h
@@ -61,8 +61,8 @@ typedef struct expression {
zero_if_empty:1, /* in case of partial aggregator computation,
some aggregators need to return 0 instead of NULL */
distinct:1,
- semantics:1, /* is vs = semantics (nil = nil vs unknown != unknown),
ranges with or without nil, aggregation with or without nil */
- any:1, /* = vs any semantics (keep nil results) */
+ semantics:1, /* 1: use the SQL 'IS NULL' semantics (i.e. nil ==
nil); 0: use the SQL '= NULL' semantics (i.e. unknown != unknown). Also
indicates ranges and aggregations with (i.e. 1) or without (i.e. 0) nil */
+ any:1, /* SQL '= NULL' vs SQL ANY semantics (i.e. 1:
keep nil results) */
need_no_nil:1,
has_no_nil:1,
unique:1, /* expression has unique values, but it may have
multiple NULL values! */
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