[github-181] make Value function work with arrays. Thanks to Miłosz Rembisz. This closes #181

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1878541 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/ss/formula/functions/Value.java

@@ -30,15 +30,17 @@ import java.time.DateTimeException;
  * Implementation for Excel VALUE() function.<p>
  *
  * <b>Syntax</b>:<br> <b>VALUE</b>(<b>text</b>)<br>
- *
+ * <p>
  * Converts the text argument to a number. Leading and/or trailing whitespace is
  * ignored. Currency symbols and thousands separators are stripped out.
  * Scientific notation is also supported. If the supplied text does not convert
  * properly the result is <b>#VALUE!</b> error. Blank string converts to zero.
  */
-public final class Value extends Fixed1ArgFunction {
+public final class Value extends Fixed1ArgFunction implements ArrayFunction {
 
-	/** "1,0000" is valid, "1,00" is not */
+    /**
+     * "1,0000" is valid, "1,00" is not
+     */
     private static final int MIN_DISTANCE_BETWEEN_THOUSANDS_SEPARATOR = 4;
     private static final Double ZERO = Double.valueOf(0.0);
 
@@ -58,6 +60,16 @@ public final class Value extends Fixed1ArgFunction {
         return new NumberEval(result.doubleValue());
     }
 
+    @Override
+    public ValueEval evaluateArray(ValueEval[] args, int srcRowIndex, int srcColumnIndex) {
+        if (args.length != 1) {
+            return ErrorEval.VALUE_INVALID;
+        }
+        return evaluateOneArrayArg(args[0], srcRowIndex, srcColumnIndex, (valA) ->
+                evaluate(srcRowIndex, srcColumnIndex, valA)
+        );
+    }
+
     /**
      * TODO see if the same functionality is needed in {@link OperandResolver#parseDouble(String)}
      *

src/testcases/org/apache/poi/hssf/usermodel/TestBugs.java

@@ -2903,6 +2903,21 @@ public final class TestBugs extends BaseTestBugzillaIssues {
     public void test63819() throws IOException {
         simpleTest("63819.xls");
     }
+
+    /**
+     * Test that VALUE behaves properly as array function and its result is handled by aggregate function
+     */
+    @Test
+    public void testValueAsArrayFunction() throws IOException {
+        try (final Workbook wb = openSampleWorkbook("TestValueAsArrayFunction.xls")) {
+            wb.getCreationHelper().createFormulaEvaluator().evaluateAll();
+            Sheet sheet = wb.getSheetAt(0);
+            Row row = sheet.getRow(0);
+            Cell cell = row.getCell(0);
+            assertEquals(6.0, cell.getNumericCellValue(), 0.0);
+        }
+    }
+
     // a simple test which rewrites the file once and evaluates its formulas
     private void simpleTest(String fileName) throws IOException {
         simpleTest(fileName, null);