func makeDefaultExprs( cols []sqlbase.ColumnDescriptor, parse *parser.Parser, evalCtx *parser.EvalContext, ) ([]parser.TypedExpr, error) { // Check to see if any of the columns have DEFAULT expressions. If there // are no DEFAULT expressions, we don't bother with constructing the // defaults map as the defaults are all NULL. haveDefaults := false for _, col := range cols { if col.DefaultExpr != nil { haveDefaults = true break } } if !haveDefaults { return nil, nil } // Build the default expressions map from the parsed SELECT statement. defaultExprs := make([]parser.TypedExpr, 0, len(cols)) exprStrings := make([]string, 0, len(cols)) for _, col := range cols { if col.DefaultExpr != nil { exprStrings = append(exprStrings, *col.DefaultExpr) } } exprs, err := parser.ParseExprsTraditional(exprStrings) if err != nil { return nil, err } defExprIdx := 0 for _, col := range cols { if col.DefaultExpr == nil { defaultExprs = append(defaultExprs, parser.DNull) continue } expr := exprs[defExprIdx] typedExpr, err := parser.TypeCheck(expr, nil, col.Type.ToDatumType()) if err != nil { return nil, err } if typedExpr, err = parse.NormalizeExpr(evalCtx, typedExpr); err != nil { return nil, err } defaultExprs = append(defaultExprs, typedExpr) defExprIdx++ } return defaultExprs, nil }