Add argument and filter example to reference/config-files/partition.md

docs/reference/config-files/partition.md

@@ -6,6 +6,12 @@ title:  partition
 
 The [partition](/docs/manage/partition) block defines the set of log rows, in a plugin-defined Tailpipe table, that come from a specified [source](/docs/manage/source). A given Tailpipe table, like `aws_cloudtrail_log`, can include multiple partitions that use one or several `source` types. 
 
+## Arguments
+
+| Argument | Type   | Optional? | Description
+|----------|--------|-----------|-----------------
+| `filter` | String | Optional  | A SQL `where` clause condition to filter log entries. Supports expressions using table columns.
+
 ## Examples
 
 You can define a partition that uses the `aws_s3_bucket` type to collect all the CloudTrail log files from an S3 bucket:
@@ -19,14 +25,28 @@ partition "aws_cloudtrail_log" "s3_bucket_all" {
 }
 ```
 
-You can use the `file_layout` argument to scope the set of collected log files using [grok patterns](https://www.elastic.co/guide/en/logstash/current/plugins-filters-grok.html?utm_source=chatgpt.com#_grok_basics). This `source` block matches only `us-east-1` rows.
+You can use the `filter` argument to exclude specific log entries with expressions using table columns:
 
 ```hcl
-partition "aws_cloudtrail_log" "s3_bucket_us_east_1" {
+partition "aws_cloudtrail_log" "ec2_write_events" {
+  # Only save EC2 write events
+  filter = "not read_only and event_source = 'ec2.amazonaws.com'"
+
   source "aws_s3_bucket" {
     connection = connection.aws.account_a
     bucket     = "aws-cloudtrail-logs-account-a"
-    file_layout   = "AWSLogs/%{NUMBER:account_id}/CloudTrail/us-east-1/%{DATA}.json.gz"    
+  }
+}
+```
+
+You can use the `file_layout` argument to scope the set of collected log files using [grok patterns](https://www.elastic.co/guide/en/logstash/current/plugins-filters-grok.html?utm_source=chatgpt.com#_grok_basics). This `source` block matches only `us-east-1` rows.
+
+```hcl
+partition "aws_cloudtrail_log" "s3_bucket_us_east_1" {
+  source "aws_s3_bucket" {
+    connection  = connection.aws.account_a
+    bucket      = "aws-cloudtrail-logs-account-a"
+    file_layout = "AWSLogs/(%{DATA:org_id}/)?%{NUMBER:account_id}/CloudTrail/us-east-1/%{DATA}.json.gz"    
   }
 }
 ```
@@ -36,12 +56,7 @@ Another `source` type, `file`, enables you to collect from local log files that
 ```hcl
 partition "aws_cloudtrail_log" "flaws" {
   source "file"  {
-  paths       = ["/Users/dboeke/flaws/flaws_cloudtrail_logs"]    
+    paths = ["/Users/dboeke/flaws/flaws_cloudtrail_logs"]    
   }
 }
 ```
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