Fix S3Select SQL column reference handling (#11957)

This change fixes handling of these types of queries:

- Double quoted column names with special characters:
    SELECT "column.name" FROM s3object
- Double quoted column names with reserved keywords:
    SELECT "CAST" FROM s3object
- Table name as prefix for column names:
    SELECT S3Object."CAST" FROM s3object

pkg/s3select/sql/utils.go

@@ -36,6 +36,27 @@ func (e *JSONPath) String() string {
 	return e.pathString
 }
 
+// StripTableAlias removes a table alias from the path. The result is also
+// cached for repeated lookups during SQL query evaluation.
+func (e *JSONPath) StripTableAlias(tableAlias string) []*JSONPathElement {
+	if e.strippedTableAlias == tableAlias {
+		return e.strippedPathExpr
+	}
+
+	hasTableAlias := e.BaseKey.String() == tableAlias || strings.ToLower(e.BaseKey.String()) == baseTableName
+	var pathExpr []*JSONPathElement
+	if hasTableAlias {
+		pathExpr = e.PathExpr
+	} else {
+		pathExpr = make([]*JSONPathElement, len(e.PathExpr)+1)
+		pathExpr[0] = &JSONPathElement{Key: &ObjectKey{ID: e.BaseKey}}
+		copy(pathExpr[1:], e.PathExpr)
+	}
+	e.strippedTableAlias = tableAlias
+	e.strippedPathExpr = pathExpr
+	return e.strippedPathExpr
+}
+
 func (e *JSONPathElement) String() string {
 	switch {
 	case e.Key != nil: