user: Question: What is the highest heat when the nationality is poland, and the lane is smaller than 6?
Columns: ['Rank', 'Heat', 'Lane', 'Name', 'Nationality', 'Time']
Types: ['real', 'real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 6.0, 4.0, 'Jessicah Schipper', 'Australia', '57.58']
SQL:

assistant: SELECT MAX("Heat") FROM "Table" WHERE "Nationality" = 'poland' AND "Lane" < 6.0;