test: add tpc-h q8 and fix expression parsing

[skyzh]

TPC-H Q8 has been broken since cross join support b/c it adds join filter support but some expressions were not handled. This pull request adds tests for TPC-H Q8 and implements between + cast expressions. Note that the type inference is broken and someone should add a Type rel node to df-repr in order to process types correctly.

[AveryQi115]

^ Note that the type inference is broken and someone should add a Type rel node to df-repr in order to process types correctly.
What does this mean?

[skyzh]

^ Note that the type inference is broken and someone should add a Type rel node to df-repr in order to process types correctly. What does this mean?

1. Cast needs to be represented as cast(child_expr, target_type). Given that we don't have a Type RelNode, we use Value(default_value) to represent a type.
2. Decimal has precisions and we did not store them. We hardcode it to be (15, 2) when converting optd representation out to DF representation.

               let expr = CastExpr::from_rel_node(expr.into_rel_node()).unwrap();
                 let child = Self::conv_from_optd_expr(expr.child(), context)?;
                 let data_type = match expr.cast_to() {
                     Value::Bool(_) => DataType::Boolean,
                     Value::Decimal128(_) => DataType::Decimal128(15, 2), /* TODO: AVOID HARD CODE PRECISION */
                     Value::Date32(_) => DataType::Date32,
                     other => unimplemented!("{}", other),
                 };

[AveryQi115]

^ Note that the type inference is broken and someone should add a Type rel node to df-repr in order to process types correctly. What does this mean?

1. Cast needs to be represented as cast(child_expr, target_type). Given that we don't have a Type RelNode, we use Value(default_value) to represent a type.
2. Decimal has precisions and we did not store them. We hardcode it to be (15, 2) when converting optd representation out to DF representation.

               let expr = CastExpr::from_rel_node(expr.into_rel_node()).unwrap();
                 let child = Self::conv_from_optd_expr(expr.child(), context)?;
                 let data_type = match expr.cast_to() {
                     Value::Bool(_) => DataType::Boolean,
                     Value::Decimal128(_) => DataType::Decimal128(15, 2), /* TODO: AVOID HARD CODE PRECISION */
                     Value::Date32(_) => DataType::Date32,
                     other => unimplemented!("{}", other),
                 };

Sure, we'll add the support soon.

[AveryQi115]

LGTM