fix(jdbc-sink): quote identifier to handle case-sensitive case (#12078)

Author: StrikeW

e2e_test/sink/remote/jdbc.check.pg.slt

@@ -33,3 +33,9 @@ select * from t_append_only order by v1, v2;
 1 aaa
 1 bbb
 2 ccc
+
+query I
+select * from biz.t2 order by "aBc";
+----
+1
+2

e2e_test/sink/remote/jdbc.load.slt

@@ -129,6 +129,26 @@ CREATE SINK s_pg_0 FROM tt1 WITH (
     force_append_only=true
 );
 
+statement ok
+CREATE TABLE tt2 (
+    "aBc" INTEGER PRIMARY KEY
+);
+
+statement ok
+CREATE SINK s_pg_t2 FROM tt2 WITH (
+    connector='jdbc',
+    jdbc.url='jdbc:postgresql://db:5432/test?user=test&password=connector',
+    table.name='t2',
+    schema.name='biz',
+    type='append-only',
+    force_append_only=true
+);
+
+statement ok
+INSERT INTO tt2 VALUES
+    (1),
+    (2);
+
 statement ok
 INSERT INTO tt1 VALUES
     (1, 'aaa'),

e2e_test/sink/remote/pg_create_table.sql

@@ -73,3 +73,7 @@ CREATE TABLE biz.t_types (
     array_column VARCHAR[],
     array_column2 DECIMAL[]
 );
+
+CREATE TABLE biz.t2 (
+    "aBc" INTEGER PRIMARY KEY
+);

java/connector-node/risingwave-sink-jdbc/src/main/java/com/risingwave/connector/jdbc/PostgresDialect.java

@@ -45,7 +45,8 @@ public String getNormalizedTableName(SchemaTableName schemaTableName) {
 
     @Override
     public String quoteIdentifier(String identifier) {
-        return identifier;
+        // quote identifier will be case-sensitive in postgres
+        return "\"" + identifier + "\"";
     }
 
     @Override