Merge branch '398772-json-serialization-of-bigdecimal-values-in-postgres-14' into 'master'

Casts EXTRACT result as double precision in preparation for PG 14

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/117150



Merged-by: Roy Zwambag <rzwambag@gitlab.com>
Approved-by: Roy Zwambag <rzwambag@gitlab.com>
Approved-by: Adam Hegyi <ahegyi@gitlab.com>
Approved-by: Aaron Huntsman <ahuntsman@gitlab.com>
Co-authored-by: Leonardo Rosa <ldarosa@gitlab.com>

app/models/concerns/analytics/cycle_analytics/stage_event_model.rb

@@ -74,7 +74,7 @@ def upsert_data(data)
           query = <<~SQL
           INSERT INTO #{quoted_table_name}
           (
-            stage_event_hash_id, 
+            stage_event_hash_id,
             #{connection.quote_column_name(issuable_id_column)},
             group_id,
             project_id,

lib/gitlab/analytics/cycle_analytics/average.rb

@@ -41,7 +41,7 @@ def average
         end
 
         def average_in_seconds
-          Arel::Nodes::Extract.new(average, :epoch)
+          Arel::Nodes::NamedFunction.new('CAST', [Arel::Nodes::Extract.new(average, :epoch).as('double precision')])
         end
       end
     end

lib/gitlab/analytics/cycle_analytics/median.rb

@@ -38,7 +38,8 @@ def percentile_cont
         end
 
         def median_duration_in_seconds
-          Arel::Nodes::Extract.new(percentile_cont, :epoch)
+          Arel::Nodes::NamedFunction.new('CAST',
+            [Arel::Nodes::Extract.new(percentile_cont, :epoch).as('double precision')])
         end
       end
     end

lib/gitlab/analytics/cycle_analytics/stage_query_helpers.rb

@@ -13,7 +13,9 @@ def zero_interval
         end
 
         def round_duration_to_seconds
-          Arel::Nodes::NamedFunction.new('ROUND', [Arel::Nodes::Extract.new(duration, :epoch)])
+          Arel::Nodes::NamedFunction.new('ROUND', [
+            Arel::Nodes::NamedFunction.new('CAST', [Arel::Nodes::Extract.new(duration, :epoch).as('double precision')])
+          ])
         end
 
         def duration