[CBRD-25128] In STRING_CAT '||' operation, incorrect handling of null when setting oracle_style_empty_string #4842
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… when setting oracle_style_empty_string
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… when setting oracle_style_empty_string (CUBRID#4842) http://jira.cubrid.org/browse/CBRD-25128
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… when setting oracle_style_empty_string (CUBRID#4842) http://jira.cubrid.org/browse/CBRD-25128
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… when setting oracle_style_empty_string (#4842) (#5065) http://jira.cubrid.org/browse/CBRD-25128 This is a back port for 11.3 patch
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… when setting oracle_style_empty_string (#4842) (#5066) http://jira.cubrid.org/browse/CBRD-25128 This is a back port for 10.2 patch
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… when setting oracle_style_empty_string (CUBRID#4842) http://jira.cubrid.org/browse/CBRD-25128
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http://jira.cubrid.org/browse/CBRD-25128
When oracle_style_empty_string is set, empty string '' is treated as null. And NULL is treated as NULL, but STRING_CAT operations such as '||' must be treated as empty string ''. Because ORACLE has NULL and || This is because the operation result is not NULL but an empty string.