public SelectStatement(
List<FromTableReference> tables,
List<ExpressionNode> projExprs,
ExpressionNode where,
List<SortingSpecification> order,
LimitSpecification limit,
SetQuantifier setQuant,
List<MysqlSelectOption> options,
List<SortingSpecification> grouping,
ExpressionNode havingExpr,
Boolean locking,
AliasInformation ai,
SourceLocation loc) {
super(loc);
setAliases(ai);
setTables(tables);
setProjection(projExprs);
setWhereClause(where);
setOrderBy(order);
setLimit(limit);
setGroupBy(grouping);
setHavingExpression(havingExpr);
this.setQuantifier = setQuant;
setSelectOptions(options);
this.locking = locking;
}
protected SelectStatement buildAggCommand(SelectStatement in) {
SelectStatement out = CopyVisitor.copy(in);
// we're going to build
// select Name, max(Engine), max(Version), max(Row_format),
// sum(Rows), avg(Avg_row_length), sum(Data_length),
// max(Max_data_length), sum(Index_length),
// sum(Data_free), max(Auto_increment), min(Create_time),
// max(Update_time), max(Check_time),
// max(Collation), null /*Checksum*/, max(Create_options), max(Comment) from temp1 group by Name
// eventually we will build another temp table of rewrite info (visible name, auto_inc values)
// and join
// but for now this is good enough
List<ExpressionNode> proj = new ArrayList<ExpressionNode>();
ExpressionAlias nameColumn = null;
for (ExpressionNode en : out.getProjection()) {
ExpressionAlias ea = (ExpressionAlias) en;
ColumnInstance ci = (ColumnInstance) ea.getTarget();
String cn = ci.getColumn().getName().getUnquotedName().get();
FunctionCall fc = null;
if (maxedColumns.contains(cn)) {
fc = new FunctionCall(FunctionName.makeMax(), ci);
} else if (summedColumns.contains(cn)) {
fc = new FunctionCall(FunctionName.makeSum(), ci);
} else if ("Name".equals(cn)) {
fc = null;
nameColumn = ea;
} else if ("Avg_row_length".equals(cn)) {
fc =
new FunctionCall(
FunctionName.makeRound(), new FunctionCall(FunctionName.makeAvg(), ci));
} else if ("Create_time".equals(cn)) {
fc = new FunctionCall(FunctionName.makeMin(), ci);
} else if ("Checksum".equals(cn)) {
fc = null;
ea =
new ExpressionAlias(
LiteralExpression.makeNullLiteral(),
new NameAlias(ci.getColumn().getName().getUnqualified()),
false);
} else {
throw new SchemaException(Pass.PLANNER, "Unknown show status column: " + cn);
}
if (fc != null) {
ea =
new ExpressionAlias(
fc, new NameAlias(ci.getColumn().getName().getUnqualified()), false);
}
proj.add(ea);
}
out.setProjection(proj);
SortingSpecification ngb = new SortingSpecification(nameColumn.buildAliasInstance(), true);
ngb.setOrdering(Boolean.FALSE);
out.getGroupBysEdge().add(ngb);
return out;
}
@Override
public ProjectionInfo getProjectionMetadata(SchemaContext sc) {
// we can't actually normalize yet - produces the wrong results for prepare
if (projectionMetadata == null) {
List<ExpressionNode> proj = getProjection();
proj = expandWildcards(sc, proj);
projectionMetadata = buildProjectionMetadata(sc, proj);
setProjection(proj);
}
return projectionMetadata;
}
@Override
public void normalize(SchemaContext pc) {
// we've already resolved everything. now we:
// [1] expand all wildcards and table wildcards (except for count(*))
// this is easy for the projection - walk down the list and look for naked wildcards or
// table wildcards
List<ExpressionNode> proj = getProjection();
proj = expandWildcards(pc, proj);
if (projectionMetadata == null || projectionMetadata.getWidth() != proj.size())
projectionMetadata = buildProjectionMetadata(pc, proj);
// [2] assign aliases for everything that does not already use an alias
// for the projection, this is easy - just walk down the list and anything that is
// not a DerivedColumn must need an alias
proj = assignProjectionAliases(pc, proj, getAliases());
setProjection(proj);
// for order by, group by, etc. now that the projection aliases are set, use them in any clauses
normalizeSorts(pc);
}
