to fix aggregations with multiple partition by, update README.md + keywords and documentation related to aggregate functions, add query normalization before parsing the latter

Author: fupelaqu

README.md

@@ -122,7 +122,7 @@ trait ScrollApi extends ElasticClientHelpers {
   )(implicit system: ActorSystem): Source[(Map[String, Any], ScrollMetrics), NotUsed] = {
     sql.request match {
       case Some(Left(single)) =>
-        if (single.windowFunctions.nonEmpty)
+        if (single.windowFunctions.nonEmpty && single.fields.nonEmpty)
           return scrollWithWindowEnrichment(sql, single, config)
 
         val sqlRequest = single.copy(score = sql.score)

bridge/src/main/scala/app/softnetwork/elastic/sql/bridge/ElasticAggregation.scala

@@ -68,7 +68,7 @@ trait SearchApi extends ElasticConversion with ElasticClientHelpers {
           collection.immutable.Seq(single.sources: _*),
           sql = Some(sql.query)
         )
-        if (single.windowFunctions.exists(_.isWindowing))
+        if (single.windowFunctions.exists(_.isWindowing) && single.fields.nonEmpty)
           searchWithWindowEnrichment(sql, single)
         else
           singleSearch(elasticQuery, single.fieldAliases, single.sqlAggregations)

core/src/main/scala/app/softnetwork/elastic/client/ScrollApi.scala

@@ -43,6 +43,7 @@ Count rows or non-null expressions. With `DISTINCT` counts distinct values.
 COUNT(*)
 COUNT(expr)
 COUNT(DISTINCT expr)
+COUNT(*) OVER (PARTITION BY partition_expr, ...) --(since v0.14.0)
 ```
 
 **Inputs:**
@@ -195,6 +196,7 @@ Sum of values.
 ```sql
 SUM(expr)
 SUM(DISTINCT expr)
+SUM(expr) OVER (PARTITION BY partition_expr, ...) --(since v0.14.0)
 ```
 
 **Inputs:**
@@ -342,6 +344,7 @@ Average of values.
 ```sql
 AVG(expr)
 AVG(DISTINCT expr)
+AVG(expr) OVER (PARTITION BY partition_expr, ...) --(since v0.14.0)
 ```
 
 **Inputs:**
@@ -491,6 +494,7 @@ Minimum value in group.
 **Syntax:**
 ```sql
 MIN(expr)
+MIN(expr) OVER (PARTITION BY partition_expr, ...) --(since v0.14.0)
 ```
 
 **Inputs:**
@@ -618,6 +622,7 @@ Maximum value in group.
 **Syntax:**
 ```sql
 MAX(expr)
+MAX(expr) OVER (PARTITION BY partition_expr, ...) --(since v0.14.0)
 ```
 
 **Inputs:**
@@ -1075,9 +1080,9 @@ SELECT
   ARRAY_AGG(name) OVER (
     PARTITION BY department 
     ORDER BY hire_date ASC
+    LIMIT 100
   ) AS employees
-FROM emp
-LIMIT 100;
+FROM emp;
 -- Result: employees as an array of name values per department (sorted and limited)
 ```
 
@@ -1192,27 +1197,9 @@ SELECT
   ARRAY_AGG(name) OVER (
     PARTITION BY department 
     ORDER BY hire_date ASC
+    LIMIT 100  -- Important: limits result set size
   ) AS employees
-FROM emp
-LIMIT 100;  -- Important: limits result set size
-```
-
-**Comparison with STRING_AGG (if available):**
-```sql
--- ARRAY_AGG returns array
-SELECT 
-  department,
-  ARRAY_AGG(name) OVER (PARTITION BY department) AS name_array
 FROM emp;
--- Result: ['John', 'Jane', 'Bob']
-
--- STRING_AGG returns string (if supported)
-SELECT 
-  department,
-  STRING_AGG(name, ', ') AS name_string
-FROM emp
-GROUP BY department;
--- Result: 'John, Jane, Bob'
 ```
 
 ---

core/src/main/scala/app/softnetwork/elastic/client/SearchApi.scala

@@ -14,6 +14,7 @@ GROUP BY
 HAVING  
 ORDER BY  
 OFFSET  
+LIMIT
 
 ## Aliases and type conversion
 AS  
@@ -31,6 +32,7 @@ AVG
 MIN  
 MAX  
 OVER  
+PARTITION BY  
 FIRST_VALUE  
 LAST_VALUE  
 ARRAY_AGG 
@@ -87,22 +89,23 @@ ISNOTNULL
 NULLIF
 
 ## Date/Time/Datetime/Timestamp functions
-YEAR  
-QUARTER  
-MONTH  
-WEEK  
-DAY  
-HOUR  
-MINUTE  
-SECOND  
-MILLISECOND  
-MICROSECOND  
-NANOSECOND  
-EPOCHDAY  
-OFFSET_SECONDS  
-LAST_DAY  
-WEEKDAY  
-YEARDAY  
+[//]: # (YEAR  )
+[//]: # (QUARTER  )
+[//]: # (MONTH  )
+[//]: # (WEEK  )
+[//]: # (DAY  )
+[//]: # (HOUR  )
+[//]: # (MINUTE  )
+[//]: # (SECOND  )
+[//]: # (MILLISECOND  )
+[//]: # (MICROSECOND  )
+[//]: # (NANOSECOND  )
+[//]: # (EPOCHDAY  )
+[//]: # (OFFSET_SECONDS  )
+[//]: # (LAST_DAY  )
+[//]: # (LASTDAY)
+[//]: # (WEEKDAY  )
+[//]: # (YEARDAY  )
 INTERVAL  
 CURRENT_DATE  
 CURDATE