fix LOOKUP function for Array form

[stanim]

PR Details

Support Array form use of function LOOKUP

Description

Excelize already supports the Vector form of LOOKUP. This pull request fixes Array form use of function LOOKUP. As a result these two expressions are equivalent and return the same result:

LOOKUP(E3,E2:E5,F2:F5)
LOOKUP(E3,E2:F5)

Related Issue

Fixes #994

Motivation and Context

This helps with Excels from third party, where one has no control which form of LOOKUP is used.

How Has This Been Tested

Added tests to calc_test.go

Tested on:

• OS: Archlinux 5.13.10-arch1-1
• WPS Spreadsheets (version wps-office 11.1.0.10702-1)
• LibreCalc (version libreoffice-fresh 7.1.5-2)

Types of changes

• Docs change / refactoring / dependency upgrade
• [ x] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [ x] My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• [x ] I have read the CONTRIBUTING document.
• [x ] I have added tests to cover my changes.
• [ x] All new and existing tests passed.