columnIndexName function
The name of the index of the column column of the table table, which is
declared with a standard index, as PostgreSQL names one,
<table>_<column>_idx, quoted.
Implementation
String columnIndexName(String table, String column) => sql.quotePostgresPart(
'${sql.unqualifiedPostgresName(table)}_'
'${sql.unquoteIdentifier(column, '"')}_idx',
);