From 16d5ab12dac89280e3b49b163fae47720d0cf524 Mon Sep 17 00:00:00 2001
From: Ruslan Iushchenko <yruslan@gmail.com>
Date: Tue, 28 Jul 2026 15:00:45 +0200
Subject: [PATCH] #862 Exclude custom option namespaces from redundant option
 validation.

---
 .../cobrix/cobol/parser/CopybookParser.scala    |  2 +-
 .../parameters/CobolParametersParser.scala      |  7 ++++++-
 .../cobrix/spark/cobol/CobolSchemaSpec.scala    | 17 +++++++++++++++++
 3 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/cobol-parser/src/main/scala/za/co/absa/cobrix/cobol/parser/CopybookParser.scala b/cobol-parser/src/main/scala/za/co/absa/cobrix/cobol/parser/CopybookParser.scala
index fda49abf..4b29c88d 100644
--- a/cobol-parser/src/main/scala/za/co/absa/cobrix/cobol/parser/CopybookParser.scala
+++ b/cobol-parser/src/main/scala/za/co/absa/cobrix/cobol/parser/CopybookParser.scala
@@ -305,7 +305,7 @@ object CopybookParser extends Logging {
     validateFieldParentMap(correctedFieldParentMap)
 
     val transformers = Seq(
-      // Calculate sized of fields and their positions from the beginning of a record
+      // Calculate sizes of fields and their positions from the beginning of a record
       BinaryPropertiesAdder(),
       // Adds virtual primitive fields for GROUPs that can be parsed as concatenation of their children.
       NonTerminalsAdder(nonTerms, enc, stringTrimmingPolicy, ebcdicCodePage, asciiCharset, isUtf16BigEndian, floatingPointFormat, strictSignOverpunch, improvedNullDetection),
diff --git a/cobol-parser/src/main/scala/za/co/absa/cobrix/cobol/reader/parameters/CobolParametersParser.scala b/cobol-parser/src/main/scala/za/co/absa/cobrix/cobol/reader/parameters/CobolParametersParser.scala
index c39e19cc..3e4919b6 100644
--- a/cobol-parser/src/main/scala/za/co/absa/cobrix/cobol/reader/parameters/CobolParametersParser.scala
+++ b/cobol-parser/src/main/scala/za/co/absa/cobrix/cobol/reader/parameters/CobolParametersParser.scala
@@ -946,7 +946,12 @@ object CobolParametersParser extends Logging {
       if (params.isKeyUsed(key)) {
         None
       } else {
-        Some(key)
+        val lowercaseKey = key.toLowerCase
+        if (lowercaseKey.startsWith("custom") || lowercaseKey.startsWith("hidam_") || lowercaseKey.startsWith("db2_") || lowercaseKey.startsWith("_")) {
+          None
+        } else {
+          Some(key)
+        }
       }
     })
 
diff --git a/spark-cobol/src/test/scala/za/co/absa/cobrix/spark/cobol/CobolSchemaSpec.scala b/spark-cobol/src/test/scala/za/co/absa/cobrix/spark/cobol/CobolSchemaSpec.scala
index 59fc9757..c295ae49 100644
--- a/spark-cobol/src/test/scala/za/co/absa/cobrix/spark/cobol/CobolSchemaSpec.scala
+++ b/spark-cobol/src/test/scala/za/co/absa/cobrix/spark/cobol/CobolSchemaSpec.scala
@@ -722,6 +722,23 @@ class CobolSchemaSpec extends AnyWordSpec with SimpleComparisonBase {
 
       assert(ex.getMessage == "Redundant or unrecognized option(s) to 'spark-cobol': dummy_option.")
     }
+
+    "do not fail fail on redundant options explicitly used from custom options namespaces" in {
+      val copybook: String =
+        """       01  RECORD.
+          |         05  DATA                PIC X(5).
+          |""".stripMargin
+
+      CobolSchema.fromSparkOptions(Seq(copybook),
+        Map(
+          "pedantic" -> "true",
+          "custom_test" -> "dummy_value",
+          "hidam_test" -> "dummy_value",
+          "db2_test" -> "dummy_value",
+          "_some_test" -> "dummy_value"
+        )
+      )
+    }
   }
 
   "getMaximumSegmentIdLength" should {