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DRILL-1328: Support table statistics - Part 2

Add support for avg row-width and major type statistics.

Parallelize the ANALYZE implementation and stats UDF implementation to improve stats collection performance.

Update/fix rowcount, selectivity and ndv computations to improve plan costing.

Add options for configuring collection/usage of statistics.

Add new APIs and implementation for stats writer (as a precursor to Drill Metastore APIs).

Fix several stats/costing related issues identified while running TPC-H nad TPC-DS queries.

Add support for CPU sampling and nested scalar columns.

Add more testcases for collection and usage of statistics and fix remaining unit/functional test failures.

Thanks to Venki Korukanti (@vkorukanti) for the description below (modified to account for new changes). He graciously agreed to rebase the patch to latest master, fixed few issues and added few tests.

FUNCS: Statistics functions as UDFs:

Separate

Currently using FieldReader to ensure consistent output type so that Unpivot doesn't get confused. All stats columns should be Nullable, so that stats functions can return NULL when N/A.

* custom versions of "count" that always return BigInt

* HyperLogLog based NDV that returns BigInt that works only on VarChars

* HyperLogLog with binary output that only works on VarChars

OPS: Updated protobufs for new ops

OPS: Implemented StatisticsMerge

OPS: Implemented StatisticsUnpivot

ANALYZE: AnalyzeTable functionality

* JavaCC syntax more-or-less copied from LucidDB.

* (Basic) AnalyzePrule: DrillAnalyzeRel -> UnpivotPrel StatsMergePrel FilterPrel(for sampling) StatsAggPrel ScanPrel

ANALYZE: Add getMetadataTable() to AbstractSchema

USAGE: Change field access in QueryWrapper

USAGE: Add getDrillTable() to DrillScanRelBase and ScanPrel

* since ScanPrel does not inherit from DrillScanRelBase, this requires adding a DrillTable to the constructor

* This is done so that a custom ReflectiveRelMetadataProvider can access the DrillTable associated with Logical/Physical scans.

USAGE: Attach DrillStatsTable to DrillTable.

* DrillStatsTable represents the data scanned from a corresponding ".stats.drill" table

* In order to avoid doing query execution right after the ".stats.drill" table is found, metadata is not actually collected until the MaterializationVisitor is used.

** Currently, the metadata source must be a string (so that a SQL query can be created). Doing this with a table is probably more complicated.

** Query is set up to extract only the most recent statistics results for each column.

closes #729

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DRILL-932: Add support for bracketless complex expressions in SQL queries.

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DRILL-679: Support create table as query (CTAS) (contd.).

Continuation to e19606593f3173d8f82ca3074186e9ca7a960ce2.

Refactoring and align the writer interfaces similar to reader interfaces at the storage and file format level.

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DRILL-601: Support for 'Show files' command

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DRILL-679: Support create table as query (CTAS).

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DRILL-438: Add support for Views (CREATE, DROP and select)

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DRILL-399: Support USE SCHEMA. Also fixes bugs found in using default schema in queries.

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DRILL-392: Support SHOW TABLES/SCHEMAS and DESCRIBE TABLE.

Use Optiq parser template to generate Drill parser

a) exec/java-exec/pom.xml changes:

1. Write a plugin to move current existing codegen directory to target

(fmpp can't handle more than one directory as template input dir).

2. Change template directory path in fmpp plugin.

3. Extract CombinedParser.jj into target/codegen/templates directory.

4. Plugin to compile CombinedParser.jj using javacc.

b) Add parser.tdd to define values for freemarker variables in CombinedParser.jj template.

c) Define grammar and SqlCall types for new DDL statements.

d) Handlers to rewrite newly added SqlCall DDL statements as select queries from INFORMATION_SCHEMA.

  1. … 15 more files in changeset.