Add RDIFF and LDIFF udf with RANGE datetypes.

udfs/community/README.md

@@ -72,7 +72,13 @@ SELECT bqutil.fn.int(1.684)
 * [cw_parse_timestamp](#cw_parse_timestamptimeString-string-formatString-string)
 * [cw_period_intersection](#cw_period_intersectionp1-structlower-timestamp-upper-timestamp-p2-structlower-timestamp-upper-timestamp)
 * [cw_period_ldiff](#cw_period_ldiffp1-structlower-timestamp-upper-timestamp-p2-structlower-timestamp-upper-timestamp)
+* [cw_range_date_ldiff](#cw_range_date_ldiffp1-range-p2-range)
+* [cw_range_datetime_ldiff](#cw_range_datetime_ldiffp1-range-p2-range)
+* [cw_range_timestamp_ldiff](#cw_range_timestamp_ldiffp1-range-p2-range)
 * [cw_period_rdiff](#cw_period_rdiffp1-structlower-timestamp-upper-timestamp-p2-structlower-timestamp-upper-timestamp)
+* [cw_range_date_rdiff](#cw_range_date_rdiffp1-range-p2-range)
+* [cw_range_datetime_rdiff](#cw_range_datetime_rdiffp1-range-p2-range)
+* [cw_range_timestamp_rdiff](#cw_range_timestamp_rdiffp1-range-p2-range)
 * [cw_regex_mode](#cw_regex_modemode-string)
 * [cw_regexp_extract](#cw_regexp_extractstr-string-regexp-string)
 * [cw_regexp_extract_all](#cw_regexp_extract_allstr-string-regexp-string)
@@ -784,6 +790,33 @@ SELECT bqutil.fn.cw_period_ldiff(
 STRUCT(TIMESTAMP '2001-11-12 00:00:00' AS lower, TIMESTAMP '2001-11-13 00:00:00' AS upper)
 ```
 
+### [cw_range_date_ldiff(p1 RANGE<DATE>, p2 RANGE<DATE>)](cw_range_date_ldiff.sqlx)
+```sql
+SELECT cw_udf.cw_range_date_ldiff(
+  RANGE(DATE '2001-11-12', DATE '2001-11-14'),
+  RANGE(DATE '2001-11-13', DATE '2001-11-15'))
+
+RANGE(DATE '2001-11-12', DATE '2001-11-13')
+```
+
+### [cw_range_datetime_ldiff(p1 RANGE<DATETIME>, p2 RANGE<DATETIME>)](cw_range_datetime_ldiff.sqlx)
+```sql
+SELECT cw_udf.cw_range_datetime_ldiff(
+  RANGE(DATETIME '2001-11-12 00:00:00', DATETIME '2001-11-14 00:00:00'),
+  RANGE(DATETIME '2001-11-13 00:00:00', DATETIME '2001-11-15 00:00:00'))
+
+RANGE(DATETIME '2001-11-12 00:00:00', DATETIME '2001-11-13 00:00:00')
+```
+
+### [cw_range_timestamp_ldiff(p1 RANGE<TIMESTAMP>, p2 RANGE<TIMESTAMP>)](cw_range_timestamp_ldiff.sqlx)
+```sql
+SELECT cw_udf.cw_range_timestamp_ldiff(
+  RANGE(TIMESTAMP '2001-11-12 00:00:00', TIMESTAMP '2001-11-14 00:00:00'),
+  RANGE(TIMESTAMP '2001-11-13 00:00:00', TIMESTAMP '2001-11-15 00:00:00'))
+
+RANGE(TIMESTAMP '2001-11-12 00:00:00', TIMESTAMP '2001-11-13 00:00:00')
+```
+
 ### [cw_period_rdiff(p1 STRUCT<lower TIMESTAMP, upper TIMESTAMP>, p2 STRUCT<lower TIMESTAMP, upper TIMESTAMP>)](cw_period_rdiff.sqlx)
 ```sql
 SELECT bqutil.fn.cw_period_rdiff(
@@ -793,6 +826,34 @@ SELECT bqutil.fn.cw_period_rdiff(
 STRUCT(TIMESTAMP '2001-11-14 00:00:00' AS lower, TIMESTAMP '2001-11-15 00:00:00' AS upper)
 ```
 
+### [cw_range_date_rdiff(p1 RANGE<DATE>, p2 RANGE<DATE>)](cw_range_date_rdiff.sqlx)
+```sql
+SELECT cw_udf.cw_range_date_rdiff(
+  RANGE(DATE '2001-11-13', DATE '2001-11-15'),
+  RANGE(DATE '2001-11-12', DATE '2001-11-14'))
+
+RANGE(DATE '2001-11-14', DATE '2001-11-15')
+```
+
+### [cw_range_datetime_rdiff(p1 RANGE<DATETIME>, p2 RANGE<DATETIME>)](cw_range_datetime_rdiff.sqlx)
+```sql
+SELECT cw_udf.cw_range_datetime_rdiff(
+  RANGE(DATETIME '2001-11-13 00:00:00', DATETIME '2001-11-15 00:00:00'),
+  RANGE(DATETIME '2001-11-12 00:00:00', DATETIME '2001-11-14 00:00:00'))
+
+RANGE(DATETIME '2001-11-14 00:00:00', DATETIME '2001-11-15 00:00:00')
+```
+
+
+### [cw_range_timestamp_rdiff(p1 RANGE<TIMESTAMP>, p2 RANGE<TIMESTAMP>)](cw_range_timestamp_rdiff.sqlx)
+```sql
+SELECT cw_udf.cw_range_timestamp_rdiff(
+  RANGE(TIMESTAMP '2001-11-13 00:00:00', TIMESTAMP '2001-11-15 00:00:00'),
+  RANGE(TIMESTAMP '2001-11-12 00:00:00', TIMESTAMP '2001-11-14 00:00:00'))
+
+RANGE(TIMESTAMP '2001-11-14 00:00:00', TIMESTAMP '2001-11-15 00:00:00')
+```
+
 ### [cw_regex_mode(mode STRING)](cw_regex_mode.sqlx)
 Retrieve mode.
 ```sql

udfs/community/cw_range_date_ldiff.sqlx

@@ -0,0 +1,26 @@
+config { hasOutput: true }
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+CREATE OR REPLACE FUNCTION ${self()}(p1 RANGE<DATE>, p2 RANGE<DATE>) RETURNS RANGE<DATE>
+OPTIONS(description="Emulates Teradata's LDIFF operator with RANGE<DATE> inputs.")
+AS (
+  CASE
+    WHEN RANGE_OVERLAPS(p1, p2) AND RANGE_START(p1) < RANGE_START(p2) THEN
+      RANGE(RANGE_START(p1), RANGE_START(p2))
+    ELSE NULL
+  END
+);

udfs/community/cw_range_date_rdiff.sqlx

@@ -0,0 +1,26 @@
+config { hasOutput: true }
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+CREATE OR REPLACE FUNCTION ${self()}(p1 RANGE<DATE>, p2 RANGE<DATE>) RETURNS RANGE<DATE>
+OPTIONS(description="Emulates Teradata's RDIFF operator with RANGE<DATE> inputs.")
+AS (
+  CASE
+    WHEN RANGE_OVERLAPS(p1, p2) AND RANGE_END(p1) > RANGE_END(p2) THEN
+      RANGE(RANGE_END(p2), RANGE_END(p1))
+    ELSE NULL
+  END
+);

udfs/community/cw_range_datetime_ldiff.sqlx

@@ -0,0 +1,26 @@
+config { hasOutput: true }
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+CREATE OR REPLACE FUNCTION ${self()}(p1 RANGE<DATETIME>, p2 RANGE<DATETIME>) RETURNS RANGE<DATETIME>
+OPTIONS(description="Emulates Teradata's LDIFF operator with RANGE<DATETIME> inputs.")
+AS (
+  CASE
+    WHEN RANGE_OVERLAPS(p1, p2) AND RANGE_START(p1) < RANGE_START(p2) THEN
+      RANGE(RANGE_START(p1), RANGE_START(p2))
+    ELSE NULL
+  END
+);

udfs/community/cw_range_datetime_rdiff.sqlx

@@ -0,0 +1,26 @@
+config { hasOutput: true }
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+CREATE OR REPLACE FUNCTION ${self()}(p1 RANGE<DATETIME>, p2 RANGE<DATETIME>) RETURNS RANGE<DATETIME>
+OPTIONS(description="Emulates Teradata's RDIFF operator with RANGE<DATETIME> inputs.")
+AS (
+  CASE
+    WHEN RANGE_OVERLAPS(p1, p2) AND RANGE_END(p1) > RANGE_END(p2) THEN
+      RANGE(RANGE_END(p2), RANGE_END(p1))
+    ELSE NULL
+  END
+);

udfs/community/cw_range_timestamp_ldiff.sqlx

@@ -0,0 +1,26 @@
+config { hasOutput: true }
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+CREATE OR REPLACE FUNCTION ${self()}(p1 RANGE<TIMESTAMP>, p2 RANGE<TIMESTAMP>) RETURNS RANGE<TIMESTAMP>
+OPTIONS(description="Emulates Teradata's LDIFF operator with RANGE<TIMESTAMP> inputs.")
+AS (
+  CASE
+    WHEN RANGE_OVERLAPS(p1, p2) AND RANGE_START(p1) < RANGE_START(p2) THEN
+      RANGE(RANGE_START(p1), RANGE_START(p2))
+    ELSE NULL
+  END
+);

udfs/community/cw_range_timestamp_rdiff.sqlx

@@ -0,0 +1,26 @@
+config { hasOutput: true }
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+CREATE OR REPLACE FUNCTION ${self()}(p1 RANGE<TIMESTAMP>, p2 RANGE<TIMESTAMP>) RETURNS RANGE<TIMESTAMP>
+OPTIONS(description="Emulates Teradata's RDIFF operator with RANGE<TIMESTAMP> inputs.")
+AS (
+  CASE
+    WHEN RANGE_OVERLAPS(p1, p2) AND RANGE_END(p1) > RANGE_END(p2) THEN
+      RANGE(RANGE_END(p2), RANGE_END(p1))
+    ELSE NULL
+  END
+);