Fix negative number with cast in BETWEEN expressions

When parsing negative numbers with :: cast like `-0.11::Float32`, the
expression parsing loop in parseUnaryMinus was using LOWEST precedence,
which incorrectly consumed the `and` keyword from BETWEEN expressions.

Fix by using MUL_PREC as the threshold, which allows casts (::) and
member access (.) but stops before operators like AND.

Fixes stmt42 and stmt43 in 02892_orc_filter_pushdown and
stmt26 in 02841_parquet_filter_pushdown.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kyleconroy

parser/expression.go

@@ -1127,8 +1127,10 @@ func (p *Parser) parseUnaryMinus() ast.Expression {
 		}
 		p.nextToken() // move past number
 		// Apply postfix operators like :: using the expression parsing loop
+		// Use MUL_PREC as the threshold to allow casts (::) and member access (.)
+		// but stop before operators like AND which has lower precedence
 		left := ast.Expression(lit)
-		for !p.currentIs(token.EOF) && LOWEST < p.precedenceForCurrent() {
+		for !p.currentIs(token.EOF) && MUL_PREC < p.precedenceForCurrent() {
 			startPos := p.current.Pos
 			left = p.parseInfixExpression(left)
 			if left == nil {

parser/testdata/02841_parquet_filter_pushdown/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt26": true
-  }
-}
+{}

parser/testdata/02892_orc_filter_pushdown/metadata.json

@@ -1,6 +1 @@
-{
-  "explain_todo": {
-    "stmt42": true,
-    "stmt43": true
-  }
-}
+{}