fix(griffin): fix join metadata after making it case insensitive (#810)

core/src/main/java/io/questdb/griffin/engine/join/JoinRecordMetadata.java

@@ -141,7 +141,7 @@ public class JoinRecordMetadata extends BaseRecordMetadata implements Closeable
         final int dot = Chars.indexOf(columnName, lo, '.');
         if (dot == -1) {
             key.putStrLowerCase(null);
-            key.putStr(columnName, lo, hi);
+            key.putStrLowerCase(columnName, lo, hi);
         } else {
             key.putStrLowerCase(columnName, 0, dot);
             key.putStrLowerCase(columnName, dot + 1, columnName.length());

core/src/test/java/io/questdb/griffin/JoinTest.java

@@ -3552,6 +3552,35 @@ public class JoinTest extends AbstractGriffinTest {
         });
     }
 
+    @Test
+    public void testAsofJoin() throws Exception {
+        assertMemoryLeak(() -> {
+            compiler.compile("create table trips as (" +
+                    "  select rnd_double() fare_amount, " +
+                    "    CAST(x as Timestamp) pickup_datetime " +
+                    "  from long_sequence(5)) " +
+                    "timestamp(pickup_datetime)", sqlExecutionContext);
+
+            compiler.compile("create table weather as (" +
+                    "  select rnd_double() tempF, " +
+                    "    rnd_int() windDir, " +
+                    "    cast(x as TIMESTAMP) timestamp " +
+                    "  from long_sequence(5)) " +
+                    "timestamp(timestamp)", sqlExecutionContext);
+
+            assertQuery("pickup_datetime\tfare_amount\ttempF\twindDir\n" +
+                            "1970-01-01T00:00:00.000001Z\t0.6607777894187332\t0.6508594025855301\t-1436881714\n" +
+                            "1970-01-01T00:00:00.000002Z\t0.2246301342497259\t0.7905675319675964\t1545253512\n" +
+                            "1970-01-01T00:00:00.000003Z\t0.08486964232560668\t0.22452340856088226\t-409854405\n" +
+                            "1970-01-01T00:00:00.000004Z\t0.299199045961845\t0.3491070363730514\t1904508147\n" +
+                            "1970-01-01T00:00:00.000005Z\t0.20447441837877756\t0.7611029514995744\t1125579207\n",
+                    "SELECT pickup_datetime, fare_amount, tempF, windDir \n" +
+                            "FROM (trips WHERE pickup_datetime = '1970-01-01') \n" +
+                            "ASOF JOIN weather",
+                    "pickup_datetime", false, false, true);
+        });
+    }
+
 
     @Test
     public void testTypeMismatchFF() throws Exception {