Added support for Variable Substitution for Snowflake Target_lag (#6567)

Author: LoganPrice344

src/sqlfluff/dialects/dialect_snowflake.py

@@ -360,7 +360,7 @@
         type="copy_on_error_option",
     ),
     DynamicTableLagIntervalSegment=RegexParser(
-        r"'((DOWNSTREAM)|([1-9]\d*\s+(?:SECOND|MINUTE|HOUR|DAY)S?))'",
+        r"DYNAMIC|'.*'",
         LiteralSegment,
         type="dynamic_table_lag_interval_segment",
     ),

test/fixtures/dialects/snowflake/create_table.sql

@@ -180,12 +180,18 @@ WAREHOUSE = mywh
 AS
 SELECT * FROM my_table;
 
-CREATE OR REPLACE DYNAMIC TABLE DT_WITH_MULTIPLE_DAYS_LAG
+CREATE OR REPLACE DYNAMIC TABLE my_table
 TARGET_LAG = '5 days'
 WAREHOUSE = mywh
 AS
 SELECT * FROM my_table;
 
+CREATE OR REPLACE DYNAMIC TABLE my_table
+TARGET_LAG = '${my_time_variable}'
+WAREHOUSE = mywh
+AS
+SELECT * FROM my_table;
+
 CREATE OR REPLACE TABLE IF NOT EXISTS EXAMPLE_TABLE_WITH_RLS (
   EXAMPLE VARCHAR
   ) WITH ROW ACCESS POLICY my_db.my_schema.rls_policy ON (EXAMPLE);

test/fixtures/dialects/snowflake/create_table.yml

@@ -3,7 +3,7 @@
 # computed by SQLFluff when running the tests. Please run
 # `python test/generate_parse_fixture_yml.py`  to generate them after adding or
 # altering SQL files.
-_hash: c533f7884aa98a0aa3e740d7dd0250b86ba138c752fcf90e018fb8e036e5b306
+_hash: dd2e987190b52eebc6a01f5f6760d192348c04857db1463679286f311412e4bf
 file:
 - statement:
     create_table_statement:
@@ -1459,7 +1459,7 @@ file:
     - keyword: DYNAMIC
     - keyword: TABLE
     - table_reference:
-        naked_identifier: DT_WITH_MULTIPLE_DAYS_LAG
+        naked_identifier: my_table
     - keyword: TARGET_LAG
     - comparison_operator:
         raw_comparison_operator: '='
@@ -1485,6 +1485,40 @@ file:
                 table_reference:
                   naked_identifier: my_table
 - statement_terminator: ;
+- statement:
+    create_table_statement:
+    - keyword: CREATE
+    - keyword: OR
+    - keyword: REPLACE
+    - keyword: DYNAMIC
+    - keyword: TABLE
+    - table_reference:
+        naked_identifier: my_table
+    - keyword: TARGET_LAG
+    - comparison_operator:
+        raw_comparison_operator: '='
+    - dynamic_table_lag_interval_segment: "'${my_time_variable}'"
+    - keyword: WAREHOUSE
+    - comparison_operator:
+        raw_comparison_operator: '='
+    - object_reference:
+        naked_identifier: mywh
+    - keyword: AS
+    - select_statement:
+        select_clause:
+          keyword: SELECT
+          select_clause_element:
+            wildcard_expression:
+              wildcard_identifier:
+                star: '*'
+        from_clause:
+          keyword: FROM
+          from_expression:
+            from_expression_element:
+              table_expression:
+                table_reference:
+                  naked_identifier: my_table
+- statement_terminator: ;
 - statement:
     create_table_statement:
     - keyword: CREATE