clone dims before changing #7740
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Pull Request Overview
This PR fixes a slice mutation issue where dimension fields and order by fields are shared between AST and select nodes. The changes ensure that slices are cloned before making modifications to prevent unintended side effects on shared data structures.
- Clones dimension field slices before modifying field names and expressions
- Clones order by field slices before modifying field names
- Replaces direct slice mutations with operations on cloned slices
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Dim fields slices are shared between ast and select nodes, so clone the slice before making modifications.
Checklist: