LakshSingla commented on a change in pull request #12163:
URL: https://github.com/apache/druid/pull/12163#discussion_r794933546



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File path: sql/src/main/codegen/includes/insert.ftl
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@@ -0,0 +1,65 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+SqlNode DruidSqlInsert() :
+{
+ SqlNode insertNode;
+ SqlNode partitionBy = null;
+ SqlNodeList clusterBy = null;
+}
+{
+    insertNode = SqlInsert()
+    [
+      <PARTITION> <BY>
+      partitionBy = StringLiteral()

Review comment:
       One more question regarding the query granularities: `TimeUnit()` in 
Calcite is defined to have the following units (from MILLISECOND to 
MILLENNIUM). 
   ```
       <MILLISECOND> { return TimeUnit.MILLISECOND; }
   |   <SECOND> { return TimeUnit.SECOND; }
   |   <MINUTE> { return TimeUnit.MINUTE; }
   |   <HOUR> { return TimeUnit.HOUR; }
   |   <DAY> { return TimeUnit.DAY; }
   |   <DOW> { return TimeUnit.DOW; }
   |   <DOY> { return TimeUnit.DOY; }
   |   <ISODOW> { return TimeUnit.ISODOW; }
   |   <ISOYEAR> { return TimeUnit.ISOYEAR; }
   |   <WEEK> { return TimeUnit.WEEK; }
   |   <MONTH> { return TimeUnit.MONTH; }
   |   <QUARTER> { return TimeUnit.QUARTER; }
   |   <YEAR> { return TimeUnit.YEAR; }
   |   <EPOCH> { return TimeUnit.EPOCH; }
   |   <DECADE> { return TimeUnit.DECADE; }
   |   <CENTURY> { return TimeUnit.CENTURY; }
   |   <MILLENNIUM> { return TimeUnit.MILLENNIUM; }
   ``` 
   Whereas in Druid's TimeUnitRange-Period map, the granularities are defined 
as 
   ```
     private static final Map<TimeUnitRange, Period> PERIOD_MAP = 
ImmutableMap.<TimeUnitRange, Period>builder()
         .put(TimeUnitRange.SECOND, Period.seconds(1))
         .put(TimeUnitRange.MINUTE, Period.minutes(1))
         .put(TimeUnitRange.HOUR, Period.hours(1))
         .put(TimeUnitRange.DAY, Period.days(1))
         .put(TimeUnitRange.WEEK, Period.weeks(1))
         .put(TimeUnitRange.MONTH, Period.months(1))
         .put(TimeUnitRange.QUARTER, Period.months(3))
         .put(TimeUnitRange.YEAR, Period.years(1))
         .build();
   ```
   i.e. there's a mismatch as to what Calcite's SQL can accept as TimeUnit, and 
what we can convert using TimeUnits class. 
   For the ingestion's `PARTITION BY` what range of time units from the above 
should be accepted by the SQL? 




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