Created attachment 38440 [details]
Example of array formula where POI returns shared string index instead of value on read

Check the attached file there are 2 columns.
Column 1 has two strings cells: "Bob" and "Alice".
Column 2 has a formula of array type and refer to column 1.
This means that in column two we should read same values.
But with getStringCellValue fn we read "Bob" and "1" instead of "Bob" and "Alice".
IF we look at shared strings, there are 2 values:
	<si>
		<t>Alice</t>
	</si>
	<si>
		<t>Bob</t>
	</si>

And if we look at row 2:

		<row r="2">
			<c r="A2" s="1" t="s">
				<v>1</v>
			</c>
			<c r="B2" s="2" t="s">
				<v>1</v>
			</c>
		</row>

Both cells here refer to same shared string "Alice", what is correct.
But getStringCellValue reads them as "Alice" and "1".
Seems because the cell is under formula, its shared string index is not resolved to the value.

Row 1 with formula:

		<row r="1">
			<c r="A1" s="1" t="s">
				<v>0</v>
			</c>
			<c r="B1" s="2" t="str">
				<f t="array" ref="B1:B2">A1:A2</f>
				<v>Alice</v>
			</c>
		</row>