@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);
}
private ProjectionInfo buildProjectionMetadata(SchemaContext pc, List<ExpressionNode> proj) {
Emitter emitter = Singletons.require(HostService.class).getDBNative().getEmitter();
try {
emitter.setOptions(EmitOptions.RESULTSETMETADATA);
emitter.pushContext(pc.getTokens());
ProjectionInfo pi = new ProjectionInfo(proj.size());
for (int i = 0; i < proj.size(); i++) {
ExpressionNode e = proj.get(i);
String columnName = null;
String aliasName = null;
ColumnInstance ci = null;
if (e.getSourceLocation() != null && e.getSourceLocation().isComputed()) {
aliasName = e.getSourceLocation().getText();
}
if (e instanceof ExpressionAlias) {
ExpressionAlias ea = (ExpressionAlias) e;
Alias aname = ea.getAlias();
if (aname != null) aliasName = PEStringUtils.dequote(aname.getSQL());
ExpressionNode cname = ea.getTarget();
StringBuilder buf = new StringBuilder();
emitter.emitExpression(pc, cname, buf);
columnName = buf.toString();
if (cname instanceof ColumnInstance) {
ci = (ColumnInstance) cname;
} else {
aliasName = PEStringUtils.dequote(aliasName);
columnName = aliasName;
}
} else if (e instanceof ColumnInstance) {
ci = (ColumnInstance) e;
StringBuilder buf = new StringBuilder();
emitter.emitExpression(pc, e, buf);
columnName = buf.toString();
aliasName = PEStringUtils.dequote(columnName);
} else {
if (aliasName != null) {
// via above
columnName = aliasName;
} else {
StringBuilder buf = new StringBuilder();
emitter.emitExpression(pc, e, buf);
columnName =
(e instanceof LiteralExpression)
? PEStringUtils.dequote(buf.toString())
: buf.toString();
aliasName = columnName;
}
}
ColumnInfo colInfo =
pi.addColumn(i + 1, columnName, (aliasName == null ? columnName : aliasName));
if (ci != null) {
String tblName = null;
String dbName = null;
Column<?> backingColumn = ci.getColumn();
TableKey tk = ci.getTableInstance().getTableKey();
if (tk instanceof MTTableKey) {
MTTableKey mtk = (MTTableKey) tk;
tblName = mtk.getScope().getName().getUnqualified().getUnquotedName().get();
PETenant tenant = mtk.getScope().getTenant(pc);
PEDatabase pdb = tenant.getDatabase(pc);
if (pdb.getMTMode() == MultitenantMode.ADAPTIVE)
dbName = tenant.getName().getUnqualified().getUnquotedName().get();
else dbName = pdb.getName().getUnqualified().getUnquotedName().get();
} else {
Table<?> tab = tk.getTable();
if (tab.isInfoSchema()) {
dbName = PEConstants.INFORMATION_SCHEMA_DBNAME;
} else {
Database<?> tabDb = tab.getDatabase(pc);
if (tab.isTempTable() && (tabDb == null)) {
tabDb = pc.getCurrentDatabase(false);
if (tabDb == null) {
tabDb = pc.getAnyNonSchemaDatabase();
}
final TempTable tabAstempTable = ((TempTable) tab);
tabAstempTable.setDatabase(pc, (PEDatabase) tabDb, true);
tabAstempTable.refreshColumnLookupTable();
}
if (tabDb != null) {
dbName = tabDb.getName().getUnqualified().getUnquotedName().get();
}
}
tblName = tab.getName(pc).getUnqualified().getUnquotedName().get();
}
if (tblName != null) colInfo.setDatabaseAndTable(dbName, tblName);
if (backingColumn instanceof PEColumn) {
// set flags
PEColumn pec = (PEColumn) backingColumn;
if (!pec.isNotNullable() || pec.isNullable())
colInfo.setAttribute(ColumnAttribute.NULLABLE);
if (pec.isAutoIncrement()) colInfo.setAttribute(ColumnAttribute.AUTO_INCREMENT);
if (pec.isKeyPart()) {
colInfo.setAttribute(ColumnAttribute.KEY_PART);
if (pec.isPrimaryKeyPart()) colInfo.setAttribute(ColumnAttribute.PRIMARY_KEY_PART);
if (pec.isUniquePart()) colInfo.setAttribute(ColumnAttribute.UNIQUE_PART);
}
}
}
}
return pi;
} finally {
emitter.popContext();
}
}
