Dynamic filter condition in BigQuery procedure - sql

Question

There is a procedure that gets the required data and then insert into table:
Is it possible to have a parameter that leads to certain filter condition, how can I achieve that?
For example, creating a new parameter called condition that if user type 1, the procedure will use filter 1 etc.
please see the code example below:
CREATE OR REPLACE PROCEDURE `peterwu.UDP_mem_profile_package`
(table_name STRING
, title_name STRING
, status_start_dt DATE
, status_end_dt DATE)
BEGIN
-- 2. insert data
EXECUTE IMMEDIATE format("""
INSERT INTO `peterwu..UDP_OUTPUT_mem_profile_aggregated`
(TITLE, GROUP_ORDER, GROUP_ID1, GROUP_NAME, MEM_CNT, TKT, SALES)
SELECT #title_name
, 5
, COUNT(DISTINCT MEM_ID) MEM_CNT
, COUNT(DISTINCT CASE WHEN IS_TICKET = 1 THEN TKT_NO END) AS TICKET
, SUM(retail_price_amt) SALES
FROM `peterwu.tlw_txn_since_2017`
WHERE TRANS_DT BETWEEN #start_dt AND #end_dt
AND MEM_ID IN (SELECT MEM_ID FROM `"""||table_name||"""`)
/*========== FILTER CONDITION CONTROLED BY USER INPUT: FILTER 1 OR FILTER 2=========*/
-- FILTER 1 --
AND
(
SITE_ID BETWEEN '1A01' AND '1A02' OR
SITE_ID BETWEEN '1A03' AND '1A04'
)
AND
-- FILTER 2 --
(
SITE_ID BETWEEN '1S01' AND '1S02' OR
SITE_ID BETWEEN '1S03' AND '1S04'
)
""")
USING status_start_dt as start_dt
, status_end_dt as end_dt
, title_name as title_name;
END

Answer 1

here's my sample code which is trying to do what you want.
basically to answer you question, it is possible to use conditional expression evaluated in the where clause. here I have assumed the input condition are two and can be assigned to two input variables and based on which where clause can be evaluated.
CREATE OR REPLACE PROCEDURE myproject.zz_DataSet.procTest
( title_name STRING
, condition1 string
, condition2 string)
BEGIN
EXECUTE IMMEDIATE format ("""
INSERT INTO myproject.zz_DataSet.zzProcTest (TITLE_NAME)
SELECT firstname
FROM myproject.zz_DataSet.tblOne
WHERE "condition1" = if(#c1 is null,#c2 ,#c1)
"""
)
USING condition1 as c1,
condition2 as c2;
END;
here's my call to procedure. in this case condition 1 is evaluated to true and hence inserts condition1 in table tblOne. hope this helps
call myproject.zz_DataSet.procTest("condition1","condition1","")