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How to avoid this error message when i make projection?

HyeontaeJuHyeontaeJu Vertica Customer

The error message is this
"Delete performance of projection newbiz_product.ws_product_category_map_DBD_1_rep_wshop_prod_map_b1 is a concern. The squared number of rows scanned for each delete is recorded to be 28947035 on average"


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