Merge pull request #1702 from taozhi8833998/feat-string-agg-bigquery

feat: support string_agg function in bigquery

Author: taozhi8833998

pegjs/bigquery.pegjs

@@ -2450,7 +2450,7 @@ over_partition
   / on_update_current_timestamp
 
 aggr_fun_count
-  = name:KW_COUNT __ LPAREN __ arg:count_arg __ RPAREN __ bc:over_partition? {
+  = name:(KW_COUNT / 'string_agg'i) __ LPAREN __ arg:count_arg __ RPAREN __ bc:over_partition? {
       return {
         type: 'aggr_func',
         name: name,

test/bigquery.spec.js

@@ -808,6 +808,13 @@ describe('BigQuery', () => {
         "CREATE OR REPLACE TEMP TABLE table1 DEFAULT COLLATE 'und:ci' PARTITION BY DATE(event_time) CLUSTER BY id OPTIONS (require_partition_filter = TRUE) AS SELECT table2.id, table2.value, table2.event_time FROM table2"
       ]
     },
+    {
+      title: 'string_agg function',
+      sql: [
+        'SELECT string_agg(DISTINCT column1) as some_column1, string_agg(column2) as some_column1 from table1',
+        'SELECT string_agg(DISTINCT column1) AS some_column1, string_agg(column2) AS some_column1 FROM table1'
+      ]
+    },
   ]
 
   SQL_LIST.forEach(sqlInfo => {