Enum RenderMode 

pub enum RenderMode {
    Canonical,
    Parenthesized,
    Redacted,
}

How a Render impl spells a node.

Variants

Canonical

Round-trippable SQL with the minimal parentheses the binding-power table requires.

Parenthesized

Every binary/unary subexpression fully parenthesized: the precedence oracle used by testing.

Redacted

Identifier and literal content replaced by fixed placeholders — id for every identifier, ? for every literal — while query shape is preserved, yielding a stable, PII-free query fingerprint.

Two statements produce the same redacted string exactly when they differ only along a dimension masking erases:

• identifier spelling: every name (column, table, alias, function, and each qualified part) becomes id, so a and b coincide;
• identifier quoting: the delimiters are dropped before the symbol is resolved, so a, "a", `a`, and [a] all become id (a keyword spelled as an identifier masks the same way);
• literal value: every literal becomes ?, so 1 and 999, 'x' and a secret string, TRUE and NULL coincide;
• keyword casing: canonical rendering upper-cases keywords, so select and SELECT coincide.

Query shape is kept, so the fingerprint still separates statements that differ in clause structure, projection/list arity, qualified-name arity (id vs id.id), operators or keywords (= vs <, AND vs OR, SELECT vs SELECT DISTINCT), or the parentheses the binding-power table requires.

The result is a fingerprint, not guaranteed re-parseable — only Canonical round-trips. A masked literal renders as ?, the anonymous-parameter sigil, which only lexes under a dialect that enables it (neither ANSI nor PostgreSQL do) and, even then, would re-parse as a parameter rather than the literal it replaced. An identifier-only redaction happens to re-parse, but that is incidental, not a promise.

Trait Implementations

impl Clone for RenderMode

fn clone(&self) -> RenderMode

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for RenderMode

impl Debug for RenderMode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for RenderMode

fn default() -> RenderMode

Returns the “default value” for a type.

impl Eq for RenderMode

impl PartialEq for RenderMode

fn eq(&self, other: &RenderMode) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for RenderMode