How to use

hasImplicitTableAlias

method

in

org.apache.calcite.sql.SqlDialect

/** Converts a non-query node into a SELECT node. Set operators (UNION,
 * INTERSECT, EXCEPT) remain as is. */
public SqlSelect asSelect() {
 if (node instanceof SqlSelect) {
  return (SqlSelect) node;
 }
 if (!dialect.hasImplicitTableAlias()) {
  return wrapSelect(asFrom());
 }
 return wrapSelect(node);
}

/** Converts a non-query node into a SELECT node. Set operators (UNION,
 * INTERSECT, EXCEPT) remain as is. */
public SqlSelect asSelect() {
 if (node instanceof SqlSelect) {
  return (SqlSelect) node;
 }
 if (!dialect.hasImplicitTableAlias()) {
  return wrapSelect(asFrom());
 }
 return wrapSelect(node);
}

/** Creates a result based on a single relational expression. */
public Result result(SqlNode node, Collection<Clause> clauses,
  RelNode rel, Map<String, RelDataType> aliases) {
 assert aliases == null
   || aliases.size() < 2
   || aliases instanceof LinkedHashMap
   || aliases instanceof ImmutableMap
   : "must use a Map implementation that preserves order";
 final String alias2 = SqlValidatorUtil.getAlias(node, -1);
 final String alias3 = alias2 != null ? alias2 : "t";
 final String alias4 =
   SqlValidatorUtil.uniquify(
     alias3, aliasSet, SqlValidatorUtil.EXPR_SUGGESTER);
 if (aliases != null
   && !aliases.isEmpty()
   && (!dialect.hasImplicitTableAlias()
    || aliases.size() > 1)) {
  return new Result(node, clauses, alias4, rel.getRowType(), aliases);
 }
 final String alias5;
 if (alias2 == null
   || !alias2.equals(alias4)
   || !dialect.hasImplicitTableAlias()) {
  alias5 = alias4;
 } else {
  alias5 = null;
 }
 return new Result(node, clauses, alias5, rel.getRowType(),
   ImmutableMap.of(alias4, rel.getRowType()));
}

/** Creates a result based on a single relational expression. */
public Result result(SqlNode node, Collection<Clause> clauses,
  RelNode rel, Map<String, RelDataType> aliases) {
 assert aliases == null
   || aliases.size() < 2
   || aliases instanceof LinkedHashMap
   || aliases instanceof ImmutableMap
   : "must use a Map implementation that preserves order";
 final String alias2 = SqlValidatorUtil.getAlias(node, -1);
 final String alias3 = alias2 != null ? alias2 : "t";
 final String alias4 =
   SqlValidatorUtil.uniquify(
     alias3, aliasSet, SqlValidatorUtil.EXPR_SUGGESTER);
 if (aliases != null
   && !aliases.isEmpty()
   && (!dialect.hasImplicitTableAlias()
    || aliases.size() > 1)) {
  return new Result(node, clauses, alias4, rel.getRowType(), aliases);
 }
 final String alias5;
 if (alias2 == null
   || !alias2.equals(alias4)
   || !dialect.hasImplicitTableAlias()) {
  alias5 = alias4;
 } else {
  alias5 = null;
 }
 return new Result(node, clauses, alias5, rel.getRowType(),
   ImmutableMap.of(alias4, rel.getRowType()));
}

} else {
 boolean qualified =
   !dialect.hasImplicitTableAlias() || aliases.size() > 1;

} else {
 boolean qualified =
   !dialect.hasImplicitTableAlias() || aliases.size() > 1;