[Fix](Nereids) fix append_trailing_char_if_absent function return null (#40820) #41160
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| private boolean enableJoinReorderBasedCost = false; | ||
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| @VariableMgr.VarAttr(name = ENABLE_FOLD_CONSTANT_BY_BE, fuzzy = true) | ||
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| public static final String PREFER_JOIN_METHOD = "prefer_join_method"; | ||
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| public static final String ENABLE_FOLD_CONSTANT_BY_BE = "enable_fold_constant_by_be"; | ||
| public static final String DEBUG_SKIP_FOLD_CONSTANT = "debug_skip_fold_constant"; |
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do not pick new session variable to this version
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cherry-pick： #40820
example: select append_trailing_char_if_absent('it','a') would return null in original design, it can not return null when folding constant on fe any time