use of org.apache.calcite.linq4j.AbstractEnumerable in project calcite by apache.
the class CassandraTable method query.
/**
* Executes a CQL query on the underlying table.
*
* @param session Cassandra session
* @param fields List of fields to project
* @param predicates A list of predicates which should be used in the query
* @return Enumerator of results
*/
public Enumerable<Object> query(final Session session, List<Map.Entry<String, Class>> fields, final List<Map.Entry<String, String>> selectFields, List<String> predicates, List<String> order, final Integer offset, final Integer fetch) {
// Build the type of the resulting row based on the provided fields
final RelDataTypeFactory typeFactory = new SqlTypeFactoryImpl(RelDataTypeSystem.DEFAULT);
final RelDataTypeFactory.Builder fieldInfo = typeFactory.builder();
final RelDataType rowType = getRowType(typeFactory);
Function1<String, Void> addField = new Function1<String, Void>() {
public Void apply(String fieldName) {
SqlTypeName typeName = rowType.getField(fieldName, true, false).getType().getSqlTypeName();
fieldInfo.add(fieldName, typeFactory.createSqlType(typeName)).nullable(true);
return null;
}
};
if (selectFields.isEmpty()) {
for (Map.Entry<String, Class> field : fields) {
addField.apply(field.getKey());
}
} else {
for (Map.Entry<String, String> field : selectFields) {
addField.apply(field.getKey());
}
}
final RelProtoDataType resultRowType = RelDataTypeImpl.proto(fieldInfo.build());
// Construct the list of fields to project
final String selectString;
if (selectFields.isEmpty()) {
selectString = "*";
} else {
selectString = Util.toString(new Iterable<String>() {
public Iterator<String> iterator() {
final Iterator<Map.Entry<String, String>> selectIterator = selectFields.iterator();
return new Iterator<String>() {
@Override
public boolean hasNext() {
return selectIterator.hasNext();
}
@Override
public String next() {
Map.Entry<String, String> entry = selectIterator.next();
return entry.getKey() + " AS " + entry.getValue();
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
}
}, "", ", ", "");
}
// Combine all predicates conjunctively
String whereClause = "";
if (!predicates.isEmpty()) {
whereClause = " WHERE ";
whereClause += Util.toString(predicates, "", " AND ", "");
}
// Build and issue the query and return an Enumerator over the results
StringBuilder queryBuilder = new StringBuilder("SELECT ");
queryBuilder.append(selectString);
queryBuilder.append(" FROM \"" + columnFamily + "\"");
queryBuilder.append(whereClause);
if (!order.isEmpty()) {
queryBuilder.append(Util.toString(order, " ORDER BY ", ", ", ""));
}
int limit = offset;
if (fetch >= 0) {
limit += fetch;
}
if (limit > 0) {
queryBuilder.append(" LIMIT " + limit);
}
queryBuilder.append(" ALLOW FILTERING");
final String query = queryBuilder.toString();
return new AbstractEnumerable<Object>() {
public Enumerator<Object> enumerator() {
final ResultSet results = session.execute(query);
// Skip results until we get to the right offset
int skip = 0;
Enumerator<Object> enumerator = new CassandraEnumerator(results, resultRowType);
while (skip < offset && enumerator.moveNext()) {
skip++;
}
return enumerator;
}
};
}
use of org.apache.calcite.linq4j.AbstractEnumerable in project calcite by apache.
the class FilesTableFunction method eval.
/**
* Evaluates the function.
*
* @param path Directory in which to start the search. Typically '.'
* @return Table that can be inspected, planned, and evaluated
*/
public static ScannableTable eval(final String path) {
return new ScannableTable() {
public RelDataType getRowType(RelDataTypeFactory typeFactory) {
return typeFactory.builder().add("access_time", // %A@ sec since epoch
SqlTypeName.TIMESTAMP).add("block_count", // %b in 512B blocks
SqlTypeName.INTEGER).add("change_time", // %C@ sec since epoch
SqlTypeName.TIMESTAMP).add("depth", // %d depth in directory tree
SqlTypeName.INTEGER).add("device", // %D device number
SqlTypeName.INTEGER).add("file_name", // %f file name, sans dirs
SqlTypeName.VARCHAR).add("fstype", // %F file system type
SqlTypeName.VARCHAR).add("gname", // %g group name
SqlTypeName.VARCHAR).add("gid", // %G numeric group id
SqlTypeName.INTEGER).add("dir_name", // %h leading dirs
SqlTypeName.VARCHAR).add("inode", // %i inode number
SqlTypeName.BIGINT).add("link", // %l object of sym link
SqlTypeName.VARCHAR).add("perm", SqlTypeName.CHAR, // %#m permission octal
4).add("hard", // %n number of hard links
SqlTypeName.INTEGER).add("path", // %P file's name
SqlTypeName.VARCHAR).add("size", // %s file's size in bytes
SqlTypeName.BIGINT).add("mod_time", // %T@ seconds since epoch
SqlTypeName.TIMESTAMP).add("user", // %u user name
SqlTypeName.VARCHAR).add("uid", // %U numeric user id
SqlTypeName.INTEGER).add("type", SqlTypeName.CHAR, // %Y file type
1).build();
// Fields in Linux find that are currently ignored:
// %y file type (not following sym links)
// %k block count in 1KB blocks
// %p file name (including argument)
}
private Enumerable<String> sourceLinux() {
final String[] args = { "find", path, "-printf", "" + // access_time
"%A@\\0" + // block_count
"%b\\0" + // change_time
"%C@\\0" + // depth
"%d\\0" + // device
"%D\\0" + // file_name
"%f\\0" + // fstype
"%F\\0" + // gname
"%g\\0" + // gid
"%G\\0" + // dir_name
"%h\\0" + // inode
"%i\\0" + // link
"%l\\0" + // perm
"%#m\\0" + // hard
"%n\\0" + // path
"%P\\0" + // size
"%s\\0" + // mod_time
"%T@\\0" + // user
"%u\\0" + // uid
"%U\\0" + // type
"%Y\\0" };
return Processes.processLines('\0', args);
}
private Enumerable<String> sourceMacOs() {
if (path.contains("'")) {
// no injection monkey business
throw new IllegalArgumentException();
}
final String[] args = { "/bin/sh", "-c", "find '" + path + "' | xargs stat -f " + // access_time
"%a%n" + // block_count
"%b%n" + // change_time
"%c%n" + // depth: not supported by macOS stat
"0%n" + // device: we only use the high part of "H,L" device
"%Hd%n" + // filename: not supported by macOS stat
"filename%n" + // fstype: not supported by macOS stat
"fstype%n" + // gname
"%Sg%n" + // gid
"%g%n" + // dir_name: not supported by macOS stat
"dir_name%n" + // inode
"%i%n" + // link
"%Y%n" + // perm
"%Lp%n" + // hard
"%l%n" + // path
"%SN%n" + // size
"%z%n" + // mod_time
"%m%n" + // user
"%Su%n" + // uid
"%u%n" + // type
"%LT%n" };
return Processes.processLines('\n', args);
}
public Enumerable<Object[]> scan(DataContext root) {
final RelDataType rowType = getRowType(root.getTypeFactory());
final List<String> fieldNames = ImmutableList.copyOf(rowType.getFieldNames());
final String osName = System.getProperty("os.name");
final String osVersion = System.getProperty("os.version");
Util.discard(osVersion);
final Enumerable<String> enumerable;
switch(osName) {
case // tested on version 10.12.5
"Mac OS X":
enumerable = sourceMacOs();
break;
default:
enumerable = sourceLinux();
}
return new AbstractEnumerable<Object[]>() {
public Enumerator<Object[]> enumerator() {
final Enumerator<String> e = enumerable.enumerator();
return new Enumerator<Object[]>() {
Object[] current;
public Object[] current() {
return current;
}
public boolean moveNext() {
current = new Object[fieldNames.size()];
for (int i = 0; i < current.length; i++) {
if (!e.moveNext()) {
return false;
}
final String v = e.current();
try {
current[i] = field(fieldNames.get(i), v);
} catch (RuntimeException e) {
throw new RuntimeException("while parsing value [" + v + "] of field [" + fieldNames.get(i) + "] in line [" + Arrays.toString(current) + "]", e);
}
}
switch(osName) {
case "Mac OS X":
// Strip leading "./"
String path = (String) current[14];
if (path.equals(".")) {
current[14] = path = "";
// depth
current[3] = 0;
} else if (path.startsWith("./")) {
current[14] = path = path.substring(2);
// depth
current[3] = count(path, '/') + 1;
} else {
// depth
current[3] = count(path, '/');
}
final int slash = path.lastIndexOf('/');
if (slash >= 0) {
// filename
current[5] = path.substring(slash + 1);
// dir_name
current[9] = path.substring(0, slash);
} else {
// filename
current[5] = path;
// dir_name
current[9] = "";
}
// Make type values more like those on Linux
final String type = (String) current[19];
current[19] = type.equals("/") ? "d" : type.equals("") || type.equals("*") ? "f" : type.equals("@") ? "l" : type;
}
return true;
}
private int count(String s, char c) {
int n = 0;
for (int i = 0, len = s.length(); i < len; i++) {
if (s.charAt(i) == c) {
++n;
}
}
return n;
}
public void reset() {
throw new UnsupportedOperationException();
}
public void close() {
e.close();
}
private Object field(String field, String value) {
switch(field) {
case "block_count":
case "depth":
case "device":
case "gid":
case "uid":
case "hard":
return Integer.valueOf(value);
case "inode":
case "size":
return Long.valueOf(value);
case "access_time":
case "change_time":
case "mod_time":
return new BigDecimal(value).multiply(THOUSAND).longValue();
default:
return value;
}
}
};
}
};
}
public Statistic getStatistic() {
return Statistics.of(1000d, ImmutableList.of(ImmutableBitSet.of(1)));
}
public Schema.TableType getJdbcTableType() {
return Schema.TableType.TABLE;
}
public boolean isRolledUp(String column) {
return false;
}
public boolean rolledUpColumnValidInsideAgg(String column, SqlCall call, SqlNode parent, CalciteConnectionConfig config) {
return true;
}
};
}
use of org.apache.calcite.linq4j.AbstractEnumerable in project calcite by apache.
the class StdinTableFunction method eval.
public static ScannableTable eval(boolean b) {
return new ScannableTable() {
public Enumerable<Object[]> scan(DataContext root) {
final InputStream is = DataContext.Variable.STDIN.get(root);
return new AbstractEnumerable<Object[]>() {
final InputStreamReader in = new InputStreamReader(is, StandardCharsets.UTF_8);
final BufferedReader br = new BufferedReader(in);
public Enumerator<Object[]> enumerator() {
return new Enumerator<Object[]>() {
String line;
int i;
public Object[] current() {
if (line == null) {
throw new NoSuchElementException();
}
return new Object[] { i, line };
}
public boolean moveNext() {
try {
line = br.readLine();
++i;
return line != null;
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public void reset() {
throw new UnsupportedOperationException();
}
public void close() {
try {
br.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
};
}
};
}
public RelDataType getRowType(RelDataTypeFactory typeFactory) {
return typeFactory.builder().add("ordinal", SqlTypeName.INTEGER).add("line", SqlTypeName.VARCHAR).build();
}
public Statistic getStatistic() {
return Statistics.of(1000d, ImmutableList.of(ImmutableBitSet.of(1)));
}
public Schema.TableType getJdbcTableType() {
return Schema.TableType.TABLE;
}
public boolean isRolledUp(String column) {
return false;
}
public boolean rolledUpColumnValidInsideAgg(String column, SqlCall call, SqlNode parent, CalciteConnectionConfig config) {
return true;
}
};
}
use of org.apache.calcite.linq4j.AbstractEnumerable in project calcite by apache.
the class MazeTable method scan.
public Enumerable<Object[]> scan(DataContext root) {
final Random random = seed >= 0 ? new Random(seed) : new Random();
final Maze maze = new Maze(width, height);
final PrintWriter pw = Util.printWriter(System.out);
maze.layout(random, pw);
if (Maze.DEBUG) {
maze.print(pw, true);
}
return new AbstractEnumerable<Object[]>() {
public Enumerator<Object[]> enumerator() {
final Set<Integer> solutionSet;
if (solution) {
solutionSet = maze.solve(0, 0);
} else {
solutionSet = null;
}
return Linq4j.transform(maze.enumerator(solutionSet), new Function1<String, Object[]>() {
public Object[] apply(String s) {
return new Object[] { s };
}
});
}
};
}
use of org.apache.calcite.linq4j.AbstractEnumerable in project calcite by apache.
the class CsvFilterableTable method scan.
public Enumerable<Object[]> scan(DataContext root, List<RexNode> filters) {
final String[] filterValues = new String[fieldTypes.size()];
for (final Iterator<RexNode> i = filters.iterator(); i.hasNext(); ) {
final RexNode filter = i.next();
if (addFilter(filter, filterValues)) {
i.remove();
}
}
final int[] fields = CsvEnumerator.identityList(fieldTypes.size());
final AtomicBoolean cancelFlag = DataContext.Variable.CANCEL_FLAG.get(root);
return new AbstractEnumerable<Object[]>() {
public Enumerator<Object[]> enumerator() {
return new CsvEnumerator<>(source, cancelFlag, false, filterValues, new CsvEnumerator.ArrayRowConverter(fieldTypes, fields));
}
};
}
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