izveigor commented on code in PR #6662:
URL: https://github.com/apache/arrow-datafusion/pull/6662#discussion_r1237573873
##########
datafusion/optimizer/src/analyzer/type_coercion.rs:
##########
@@ -635,6 +635,20 @@ fn cast_expr(expr: &Expr, to_type: &DataType, schema:
&DFSchema) -> Result<Expr>
expr.clone().cast_to(to_type, schema)
}
+/// Cast array `expr` to the specified type, if possible
+fn cast_array_expr(
+ expr: &Expr,
+ from_type: &DataType,
+ to_type: &DataType,
+ schema: &DFSchema,
+) -> Result<Expr> {
+ if from_type.equals_datatype(&DataType::Null) {
Review Comment:
For reference, this is the first way to solve the problem (see below).
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