COALESCE woo

Author: nik9000

x-pack/plugin/esql/build.gradle

@@ -332,4 +332,31 @@ tasks.named('stringTemplates').configure {
     it.inputFile =  inInputFile
     it.outputFile = "org/elasticsearch/xpack/esql/expression/predicate/operator/comparison/InBytesRefEvaluator.java"
   }
+
+  File coalesceInputFile = file("src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/nulls/X-CoalesceEvaluator.java.st")
+  template {
+    it.properties = booleanProperties
+    it.inputFile =  coalesceInputFile
+    it.outputFile = "org/elasticsearch/xpack/esql/expression/function/scalar/nulls/CoalesceBooleanEvaluator.java"
+  }
+  template {
+    it.properties = intProperties
+    it.inputFile =  coalesceInputFile
+    it.outputFile = "org/elasticsearch/xpack/esql/expression/function/scalar/nulls/CoalesceIntEvaluator.java"
+  }
+  template {
+    it.properties = longProperties
+    it.inputFile =  coalesceInputFile
+    it.outputFile = "org/elasticsearch/xpack/esql/expression/function/scalar/nulls/CoalesceLongEvaluator.java"
+  }
+  template {
+    it.properties = doubleProperties
+    it.inputFile =  coalesceInputFile
+    it.outputFile = "org/elasticsearch/xpack/esql/expression/function/scalar/nulls/CoalesceDoubleEvaluator.java"
+  }
+  template {
+    it.properties = bytesRefProperties
+    it.inputFile =  coalesceInputFile
+    it.outputFile = "org/elasticsearch/xpack/esql/expression/function/scalar/nulls/CoalesceBytesRefEvaluator.java"
+  }
 }