jayzhan211 commented on code in PR #15253:
URL: https://github.com/apache/datafusion/pull/15253#discussion_r1999907560
##########
datafusion/expr/src/expr.rs:
##########
@@ -2596,6 +2612,176 @@ impl Display for SchemaDisplay<'_> {
}
}
+struct SqlDisplay<'a>(&'a Expr);
+impl Display for SqlDisplay<'_> {
+ fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+ match self.0 {
+ Expr::Literal(scalar) => scalar.fmt(f),
+ Expr::Placeholder(holder) => {
+ write!(f, "{}", holder.id)
+ }
+ Expr::Alias(Alias { name, .. }) => write!(f, "{name}"),
+ Expr::Between(Between {
+ expr,
+ negated,
+ low,
+ high,
+ }) => {
+ if *negated {
+ write!(
+ f,
+ "{} NOT BETWEEN {} AND {}",
+ SqlDisplay(expr),
+ SqlDisplay(low),
+ SqlDisplay(high),
+ )
+ } else {
+ write!(
+ f,
+ "{} BETWEEN {} AND {}",
+ SqlDisplay(expr),
+ SqlDisplay(low),
+ SqlDisplay(high),
+ )
+ }
+ }
+ Expr::BinaryExpr(BinaryExpr { left, op, right }) => {
+ write!(f, "{} {op} {}", SqlDisplay(left), SqlDisplay(right),)
+ }
+ Expr::Case(Case {
+ expr,
+ when_then_expr,
+ else_expr,
+ }) => {
+ write!(f, "CASE ")?;
+
+ if let Some(e) = expr {
+ write!(f, "{} ", SqlDisplay(e))?;
+ }
+
+ for (when, then) in when_then_expr {
+ write!(f, "WHEN {} THEN {} ", SqlDisplay(when),
SqlDisplay(then),)?;
+ }
+
+ if let Some(e) = else_expr {
+ write!(f, "ELSE {} ", SqlDisplay(e))?;
+ }
+
+ write!(f, "END")
+ }
+ Expr::Cast(Cast { expr, .. }) | Expr::TryCast(TryCast { expr, ..
}) => {
+ write!(f, "{}", SqlDisplay(expr))
+ }
+ Expr::InList(InList {
+ expr,
+ list,
+ negated,
+ }) => {
+ let inlist_name = sql_name_from_exprs(list)?;
+
+ if *negated {
+ write!(f, "{} NOT IN {}", SqlDisplay(expr), inlist_name)
+ } else {
+ write!(f, "{} IN {}", SqlDisplay(expr), inlist_name)
+ }
+ }
+ Expr::GroupingSet(GroupingSet::Cube(exprs)) => {
+ write!(f, "ROLLUP ({})", sql_name_from_exprs(exprs)?)
+ }
+ Expr::GroupingSet(GroupingSet::GroupingSets(lists_of_exprs)) => {
+ write!(f, "GROUPING SETS (")?;
+ for exprs in lists_of_exprs.iter() {
+ write!(f, "({})", sql_name_from_exprs(exprs)?)?;
+ }
+ write!(f, ")")
+ }
+ Expr::GroupingSet(GroupingSet::Rollup(exprs)) => {
+ write!(f, "ROLLUP ({})", sql_name_from_exprs(exprs)?)
+ }
+ Expr::IsNull(expr) => write!(f, "{} IS NULL", SqlDisplay(expr)),
+ Expr::IsNotNull(expr) => {
+ write!(f, "{} IS NOT NULL", SqlDisplay(expr))
+ }
+ Expr::IsUnknown(expr) => {
+ write!(f, "{} IS UNKNOWN", SqlDisplay(expr))
+ }
+ Expr::IsNotUnknown(expr) => {
+ write!(f, "{} IS NOT UNKNOWN", SqlDisplay(expr))
+ }
+ Expr::IsTrue(expr) => write!(f, "{} IS TRUE", SqlDisplay(expr)),
+ Expr::IsFalse(expr) => write!(f, "{} IS FALSE", SqlDisplay(expr)),
+ Expr::IsNotTrue(expr) => {
+ write!(f, "{} IS NOT TRUE", SqlDisplay(expr))
+ }
+ Expr::IsNotFalse(expr) => {
+ write!(f, "{} IS NOT FALSE", SqlDisplay(expr))
+ }
+ Expr::Like(Like {
+ negated,
+ expr,
+ pattern,
+ escape_char,
+ case_insensitive,
+ }) => {
+ write!(
+ f,
+ "{} {}{} {}",
+ SqlDisplay(expr),
+ if *negated { "NOT " } else { "" },
+ if *case_insensitive { "ILIKE" } else { "LIKE" },
+ SqlDisplay(pattern),
+ )?;
+
+ if let Some(char) = escape_char {
+ write!(f, " CHAR '{char}'")?;
+ }
+
+ Ok(())
+ }
+ Expr::Negative(expr) => write!(f, "(- {})", SqlDisplay(expr)),
+ Expr::Not(expr) => write!(f, "NOT {}", SqlDisplay(expr)),
+ Expr::Unnest(Unnest { expr }) => {
+ write!(f, "UNNEST({})", SqlDisplay(expr))
+ }
+ Expr::SimilarTo(Like {
+ negated,
+ expr,
+ pattern,
+ escape_char,
+ ..
+ }) => {
+ write!(
+ f,
+ "{} {} {}",
+ SqlDisplay(expr),
+ if *negated {
+ "NOT SIMILAR TO"
+ } else {
+ "SIMILAR TO"
+ },
+ SqlDisplay(pattern),
+ )?;
+ if let Some(char) = escape_char {
+ write!(f, " CHAR '{char}'")?;
+ }
+
+ Ok(())
+ }
+ Expr::AggregateFunction(AggregateFunction { func, params }) => {
+ match func.sql_name(params) {
+ Ok(name) => {
+ write!(f, "{name}")
+ }
+ Err(e) => {
+ write!(f, "got error from schema_name {}", e)
+ }
+ }
+ }
+ _ => write!(f, "{}", self.0.schema_name()),
Review Comment:
I think by default should be Display, `self.0.to_string()`
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