@RequiresRestart(RequiresRestart.RestartScope.SYSTEM)
    @JsonPropertyDescription(
            "Sets the prepStmtCacheSize property on the at the JDBC driver level. " +
                    "The number of prepared statements that the driver will cache per connection. " +
                    COMMON_JDBC_DESC)
    @Min(0)
    public int getPrepStmtCacheSize() {
        return prepStmtCacheSize;
    }
Merges the non-null values of other into this. If other is null return this.
stroom-config/stroom-config-common/src/main/java/stroom/config/common/ConnectionPoolConfig.java