fix(sql-check): avoid npe when virtual column exists#2031
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What type of PR is this?
type-bug
What this PR does / why we need it:
the dataType is null when a column is a virtual column and it will lead to null pointer exception, this pr fix this problem.
Which issue(s) this PR fixes:
Fixes #2028
Special notes for your reviewer:
Additional documentation e.g., usage docs, etc.: