Google translator behaves unexpectedly with Double in WHERE clause of SELECT

Query like "SELECT DoubleNum FROM SmallA WHERE DoubleNum > 5.0" gives unexpected results for following values in DoubleNum column:

• value like '15.1' is probably by google spreadsheet interpreted as date (in function row in sheet appears 15.1.2017), SELECT query returns no results
• value like '150.1': SELECT returns null