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ramkrishna.s.vasudevan commented on FLINK-3579: ----------------------------------------------- Went thro the code. Seems the RelBuilder in calcite does not support this when a String (VARCHAR) is appended with a NON_VARCHAR type. So is this a fix in Calcite? Or should FLINK identify this concatenation is with a String so convert the RHS also to String some where in its parsing layer? > Improve String concatenation > ---------------------------- > > Key: FLINK-3579 > URL: https://issues.apache.org/jira/browse/FLINK-3579 > Project: Flink > Issue Type: Bug > Components: Table API > Reporter: Timo Walther > Priority: Minor > > Concatenation of a String and non-String does not work properly. > e.g. {{f0 + 42}} leads to RelBuilder Exception > ExpressionParser does not like {{f0 + 42.cast(STRING)}} either. -- This message was sent by Atlassian JIRA (v6.3.4#6332)