Parameters binding in bulk/batch insert within stored procedure - snowflake-cloud-data-platform

Question

I've encountered a problem with parameters binding and bulk inserting in SP. I have no idea why it's not working. According to docs it should work.
CREATE TABLE TEST(
COL1 NUMBER(38,0),
COL2 NUMBER(38,0)
);
CREATE OR REPLACE PROCEDURE SP_TEST()
RETURNS FLOAT NOT NULL
LANGUAGE JAVASCRIPT
AS $$
var stmt = snowflake.createStatement({
sqlText: "INSERT INTO TEST(COL1, COL2) VALUES(?, ?)",
binds: [[1, 2], [3, 4]]
});
stmt.execute();
return 0;
$$
;
CALL SP_TEST();
Execution error in store procedure SP_TEST: Unsupported type for binding
argument 1,2 At Snowflake.createStatement, line 3 position 22

Answer 1

I could not find any sample for entering multiple rows in the documents. In case, you want to use multiple values, then you can use the following syntax:
CREATE OR REPLACE PROCEDURE SP_TEST()
RETURNS FLOAT NOT NULL
LANGUAGE JAVASCRIPT
AS $$
var stmt = snowflake.createStatement({
sqlText: "INSERT INTO TEST(COL1, COL2) VALUES(?, ?),(?, ?)",
binds: [1, 2, 3, 4]
});
stmt.execute();
return 0;
$$
;
As you can see, I removed the extra brackets in binds, and added a new "(?,?)" to the values part for the second row.

Answer 2

Try this workaround:
CREATE PROCEDURE SP_TEST()
RETURNS FLOAT NOT NULL
LANGUAGE JAVASCRIPT
AS $$
const vals = [[1, 2], [3,4]]
const binds = vals.reduce((a, b) => a.concat(b))
const placeholders = vals.map(()=>"(?, ?)").join(",")
const stmt = snowflake.createStatement({
sqlText: "INSERT INTO TEST(COL1, COL2) VALUES " + placeholders,
binds
})
stmt.execute()
return 0
$$
The idea is to flatten the array, and then dynamically append the correct number of placeholders.